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<li class="navelem"><a class="el" href="dir_460afd45d0ec637b1427e0e06a6fbcf7.html">net_flow</a></li><li class="navelem"><a class="el" href="dir_6dd0f5e913f2b13fdf6025047ac045ce.html">detail</a></li>  </ul>
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<a href="drop__timer_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">/* Flow</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment"> * Copyright 2023 Akamai Technologies, Inc.</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment"> *</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment"> * Licensed under the Apache License, Version 2.0 (the</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment"> * &quot;License&quot;); you may not use this file except in</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="comment"> * compliance with the License.  You may obtain a copy</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="comment"> * of the License at</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="comment"> *</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span><span class="comment"> *   https://www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="comment"> *</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span><span class="comment"> * Unless required by applicable law or agreed to in</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span><span class="comment"> * writing, software distributed under the License is</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span><span class="comment"> * distributed on an &quot;AS IS&quot; BASIS, WITHOUT WARRANTIES OR</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span><span class="comment"> * CONDITIONS OF ANY KIND, either express or implied.</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span><span class="comment"> * See the License for the specific language governing</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span><span class="comment"> * permissions and limitations under the License. */</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span><span class="comment"></span> </div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span><span class="comment">/// @file</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span><span class="comment"></span><span class="preprocessor">#include &quot;<a class="code" href="drop__timer_8hpp.html">flow/net_flow/detail/drop_timer.hpp</a>&quot;</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span><span class="preprocessor">#include &quot;<a class="code" href="util_2util_8hpp.html">flow/util/util.hpp</a>&quot;</span></div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span> </div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceflow_1_1net__flow.html">flow::net_flow</a></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span>{</div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span> </div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno">   25</span><span class="comment">// Implementations.</span></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno">   26</span> </div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Drop__timer.html#a64def367e38954d8a392cdf92fcc8f24">   27</a></span><a class="code hl_typedef" href="classflow_1_1util_1_1Shared__ptr__alias__holder.html#aa4f1af88393042e60159a3a67f0accbc">Drop_timer::Ptr</a> <a class="code hl_function" href="classflow_1_1net__flow_1_1Drop__timer.html#a64def367e38954d8a392cdf92fcc8f24">Drop_timer::create_drop_timer</a></div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno">   28</span>                  (<a class="code hl_class" href="classflow_1_1log_1_1Logger.html">log::Logger</a>* logger_ptr,</div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno">   29</span>                   <a class="code hl_typedef" href="namespaceflow_1_1util.html#ac3e89a8a271b0ddc76ac2a0ce488dea4">util::Task_engine</a>* node_task_engine,</div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno">   30</span>                   <a class="code hl_typedef" href="namespaceflow.html#a48799f1263cdeedec125be51a3db2b79">Fine_duration</a>* sock_drop_timeout,</div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno">   31</span>                   <a class="code hl_typedef" href="classflow_1_1util_1_1Shared__ptr__alias__holder.html#aef7998db71c60eeb5d1e3d1a97c14886">Peer_socket::Const_ptr</a>&amp;&amp; sock,</div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span>                   <span class="keyword">const</span> <a class="code hl_class" href="classflow_1_1Function.html">Function</a>&lt;<span class="keywordtype">void</span> (<span class="keyword">const</span> <a class="code hl_typedef" href="namespaceflow.html#a29eaaa9d0fac4ce87d8b969222dbed09">Error_code</a>&amp; err_code)&gt;&amp; timer_failure,</div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno">   33</span>                   <span class="keyword">const</span> <a class="code hl_class" href="classflow_1_1Function.html">Function</a>&lt;<span class="keywordtype">void</span> (<span class="keywordtype">bool</span> drop_all_packets)&gt;&amp; timer_fired) <span class="comment">// Static.</span></div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span>{</div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno">   35</span>  <span class="comment">// See doc comment for rationale.</span></div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span>  <span class="keywordflow">return</span> <a class="code hl_typedef" href="classflow_1_1util_1_1Shared__ptr__alias__holder.html#aa4f1af88393042e60159a3a67f0accbc">Ptr</a>(<span class="keyword">new</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Drop__timer.html#a9c94b0191a80afb98b6da4a2d0b47a46">Drop_timer</a>(logger_ptr,</div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno">   37</span>                            node_task_engine, sock_drop_timeout, std::move(sock),</div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno">   38</span>                            <a class="code hl_function" href="classflow_1_1net__flow_1_1Drop__timer.html#a40029643f0a6c7a2a6b20499ca4c5a67">timer_failure</a>, timer_fired));</div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span>}</div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span> </div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Drop__timer.html#abf88c319884e5c5eb1b8f63c646e90ad">   41</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Drop__timer.html#abf88c319884e5c5eb1b8f63c646e90ad">Drop_timer::start_contemporaneous_events</a>()</div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno">   42</span>{</div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno">   43</span>  <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Drop_timer [&quot;</span> &lt;&lt; <span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: contemporary events group: START.&quot;</span>);</div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno">   44</span> </div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno">   45</span>  assert(!<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#addd06c5f17e59cbfd70677831a66bc57">m_in_events_group</a>);</div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span>  <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#addd06c5f17e59cbfd70677831a66bc57">m_in_events_group</a> = <span class="keyword">true</span>;</div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span> </div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno">   48</span>  <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a2ae6617225acb8c4b0798f113c1827d0">m_at_events_start_oldest_flying_packet</a> = <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a83bacd0cfe7c6fb6349688012d472f1f">m_flying_packets</a>.empty() ? 0 : (*<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a83bacd0cfe7c6fb6349688012d472f1f">m_flying_packets</a>.begin());</div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno">   49</span>  <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a0d90b548d2c7062e1ac88b998a2fc1d5">m_during_events_newest_acked_packet</a> = 0;</div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span>}</div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span> </div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Drop__timer.html#afc1bf0978b04d454f5aa228a44550565">   52</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Drop__timer.html#afc1bf0978b04d454f5aa228a44550565">Drop_timer::on_packet_in_flight</a>(<a class="code hl_typedef" href="classflow_1_1net__flow_1_1Drop__timer.html#a0930c4da4484ffc1f8bcfbc496e5ecd0">packet_id_t</a> packet_id)</div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno">   53</span>{</div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span>  <span class="keyword">using </span>std::pair;</div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span>  <span class="keyword">using </span>boost::prior;</div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span>  <span class="keyword">using </span>std::set;</div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno">   57</span> </div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno">   58</span>  <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Drop_timer [&quot;</span> &lt;&lt; <span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: packet [&quot;</span> &lt;&lt; packet_id &lt;&lt; <span class="stringliteral">&quot;] now In-flight.&quot;</span>);</div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno">   59</span> </div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno">   60</span>  assert(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#addd06c5f17e59cbfd70677831a66bc57">m_in_events_group</a>);</div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span> </div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span><span class="preprocessor">#ifndef NDEBUG</span></div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span>  <span class="keyword">const</span> <span class="keyword">auto</span> insert_result =</div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno">   64</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno">   65</span>    <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a83bacd0cfe7c6fb6349688012d472f1f">m_flying_packets</a>.insert(packet_id);</div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span>  <span class="comment">// packet_id must never be reused (method contract).</span></div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno">   67</span>  assert(insert_result.second);</div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno">   68</span>  <span class="comment">// packet_id must always be increasing (method contract).</span></div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno">   69</span>  assert(insert_result.first == prior(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a83bacd0cfe7c6fb6349688012d472f1f">m_flying_packets</a>.end()));</div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno">   70</span>}</div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno">   71</span> </div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Drop__timer.html#a477fd69a6978cc228b8e80611aa234ba">   72</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Drop__timer.html#a477fd69a6978cc228b8e80611aa234ba">Drop_timer::on_ack</a>(<a class="code hl_typedef" href="classflow_1_1net__flow_1_1Drop__timer.html#a0930c4da4484ffc1f8bcfbc496e5ecd0">packet_id_t</a> packet_id)</div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno">   73</span>{</div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno">   74</span>  <span class="keyword">using </span>std::pair;</div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno">   75</span>  <span class="keyword">using </span>boost::prior;</div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno">   76</span> </div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno">   77</span>  <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Drop_timer [&quot;</span> &lt;&lt; <span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: packet [&quot;</span> &lt;&lt; packet_id &lt;&lt; <span class="stringliteral">&quot;] acknowledged.&quot;</span>);</div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno">   78</span> </div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno">   79</span>  assert(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#addd06c5f17e59cbfd70677831a66bc57">m_in_events_group</a>);</div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno">   80</span> </div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno">   81</span>  assert(<a class="code hl_function" href="namespaceflow_1_1util.html#a03984e29450abf9cf287c501d6c8f866">util::key_exists</a>(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a83bacd0cfe7c6fb6349688012d472f1f">m_flying_packets</a>, packet_id));</div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno">   82</span> </div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno">   83</span>  <span class="comment">// Keep track of the newest (right-most) acked packet. Starts off at 0 (reserved -- and also min. possible -- value).</span></div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno">   84</span>  <span class="keywordflow">if</span> (packet_id &gt; <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a0d90b548d2c7062e1ac88b998a2fc1d5">m_during_events_newest_acked_packet</a>)</div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno">   85</span>  {</div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno">   86</span>    <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Drop_timer [&quot;</span> &lt;&lt; <span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: acknowledged packet [&quot;</span> &lt;&lt; packet_id &lt;&lt; <span class="stringliteral">&quot;] replaces &quot;</span></div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno">   87</span>                  <span class="stringliteral">&quot;[&quot;</span> &lt;&lt; <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a0d90b548d2c7062e1ac88b998a2fc1d5">m_during_events_newest_acked_packet</a> &lt;&lt; <span class="stringliteral">&quot;] as right-most acknowledged packet.&quot;</span>);</div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno">   88</span>    <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a0d90b548d2c7062e1ac88b998a2fc1d5">m_during_events_newest_acked_packet</a> = packet_id;</div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno">   89</span>  }</div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno">   90</span>}</div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno">   91</span> </div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Drop__timer.html#a5d1fff72b5c044cba0651de0508553e0">   92</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Drop__timer.html#a5d1fff72b5c044cba0651de0508553e0">Drop_timer::on_packet_no_longer_in_flight</a>(<a class="code hl_typedef" href="classflow_1_1net__flow_1_1Drop__timer.html#a0930c4da4484ffc1f8bcfbc496e5ecd0">packet_id_t</a> packet_id)</div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno">   93</span>{</div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno">   94</span>  <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Drop_timer [&quot;</span> &lt;&lt; <span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: packet [&quot;</span> &lt;&lt; packet_id &lt;&lt; <span class="stringliteral">&quot;] now no longer In-flight.&quot;</span>);</div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno">   95</span> </div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno">   96</span>  assert(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#addd06c5f17e59cbfd70677831a66bc57">m_in_events_group</a>);</div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno">   97</span> </div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno">   98</span><span class="preprocessor">#ifndef NDEBUG</span></div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno">   99</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> num_erased =</div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno">  100</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno">  101</span>    <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a83bacd0cfe7c6fb6349688012d472f1f">m_flying_packets</a>.erase(packet_id);</div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno">  102</span>  assert(num_erased == 1);</div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno">  103</span>}</div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno">  104</span> </div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Drop__timer.html#ac5a7ab3108a915999e95ccf705006ccd">  105</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Drop__timer.html#ac5a7ab3108a915999e95ccf705006ccd">Drop_timer::on_no_packets_in_flight_any_longer</a>()</div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno">  106</span>{</div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno">  107</span>  <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Drop_timer [&quot;</span> &lt;&lt; <span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: all packets now no longer In-flight.  Send pipe empty.&quot;</span>);</div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno">  108</span> </div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno">  109</span>  assert(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#addd06c5f17e59cbfd70677831a66bc57">m_in_events_group</a>);</div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno">  110</span> </div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno">  111</span>  <span class="comment">/* As advertised. (This could be seen as unnecessarily pedantic... but algorithmic tightness is good. This is no</span></div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno">  112</span><span class="comment">   * public API but is inner code instead.) */</span></div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno">  113</span>  assert(!<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a83bacd0cfe7c6fb6349688012d472f1f">m_flying_packets</a>.empty());</div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno">  114</span> </div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno">  115</span>  <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a83bacd0cfe7c6fb6349688012d472f1f">m_flying_packets</a>.clear();</div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno">  116</span>}</div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno">  117</span> </div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Drop__timer.html#a45d4cf2dfecc2cd5c35f452cd7c8d05d">  118</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Drop__timer.html#a45d4cf2dfecc2cd5c35f452cd7c8d05d">Drop_timer::end_contemporaneous_events</a>()</div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno">  119</span>{</div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno">  120</span>  <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Drop_timer [&quot;</span> &lt;&lt; <span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: contemporary events group: END.&quot;</span>);</div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno">  121</span> </div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno">  122</span>  assert(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#addd06c5f17e59cbfd70677831a66bc57">m_in_events_group</a>);</div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno">  123</span>  <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#addd06c5f17e59cbfd70677831a66bc57">m_in_events_group</a> = <span class="keyword">false</span>;</div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno">  124</span> </div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno">  125</span>  <span class="comment">/* Now that the events-tracking time period is done, we check for the various events of interest that affect</span></div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno">  126</span><span class="comment">   * the timer itself. Essentially, we treat the on_*() calls since start_contemporaneous_events() up until now</span></div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno">  127</span><span class="comment">   * as one operation. By comparing the situation &quot;then&quot; to &quot;now,&quot; we detect the various conditions. */</span></div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno">  128</span> </div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno">  129</span>  <span class="keywordflow">if</span> (<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a2ae6617225acb8c4b0798f113c1827d0">m_at_events_start_oldest_flying_packet</a> == 0) <span class="comment">// I.e., m_flying_packets.empty() was true at start_...() time.</span></div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno">  130</span>  {</div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno">  131</span>    <span class="keywordflow">if</span> (!<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a83bacd0cfe7c6fb6349688012d472f1f">m_flying_packets</a>.empty())</div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno">  132</span>    {</div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno">  133</span>      <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Drop_timer [&quot;</span> &lt;&lt; <span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: send pipe no longer empty (first packet In-flight).&quot;</span>);</div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno">  134</span> </div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno">  135</span>      <span class="comment">/* Sent the first packet after nothing In-flight, so timer should be off.  Simply start it with</span></div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno">  136</span><span class="comment">       * current DTO.  RFC 6298 and common sense support this.  Note, though, that we&#39;re slightly different, in that</span></div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno">  137</span><span class="comment">       * we react to packet actually being sent off vs. merely being about to be sent off pending pacing. */</span></div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno">  138</span>      <a class="code hl_function" href="classflow_1_1net__flow_1_1Drop__timer.html#a4a5f0bbb91232e17e258722e4dfa237b">start_timer</a>();</div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno">  139</span>    }</div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno">  140</span>  }</div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno">  141</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a83bacd0cfe7c6fb6349688012d472f1f">m_flying_packets</a>.empty()) <span class="comment">// I.e., m_flying_packets.empty() went from false (then) to true (now).</span></div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno">  142</span>  {</div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno">  143</span>    <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Drop_timer [&quot;</span> &lt;&lt; <span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: send pipe empty.&quot;</span>);</div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno">  144</span> </div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno">  145</span>    <span class="comment">/* Timer should be on, but last packet(s) have been acked or Dropped -- nothing else to wait</span></div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno">  146</span><span class="comment">     * for; so just turn the timer off.  RFC 6298 and common sense support this. */</span></div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno">  147</span>    <a class="code hl_function" href="classflow_1_1net__flow_1_1Drop__timer.html#ad655d5461aa5a6bf9a80d28e4a4fdd77">disable_timer</a>();</div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno">  148</span>  }</div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno">  149</span>  <span class="keywordflow">else</span> <span class="comment">// I.e., m_flying_packets.empty() was false (then) -- and still is (now).</span></div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno">  150</span>  {</div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno">  151</span>    <span class="keyword">const</span> <a class="code hl_typedef" href="classflow_1_1net__flow_1_1Drop__timer.html#a0930c4da4484ffc1f8bcfbc496e5ecd0">packet_id_t</a> at_events_end_oldest_packet = *<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a83bacd0cfe7c6fb6349688012d472f1f">m_flying_packets</a>.begin();</div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno">  152</span> </div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno">  153</span>    <span class="keywordflow">if</span> (at_events_end_oldest_packet != <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a2ae6617225acb8c4b0798f113c1827d0">m_at_events_start_oldest_flying_packet</a>)</div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno">  154</span>    {</div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno">  155</span>      <span class="comment">// A different packet is oldest (now) vs. oldest packet (then). The latter must have been Acked or Dropped.</span></div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno">  156</span> </div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno">  157</span>      <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Drop_timer [&quot;</span> &lt;&lt; <span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: send pipe&#39;s left edge moved to the right.&quot;</span>);</div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno">  158</span> </div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno">  159</span>      <span class="comment">/* Timer should be on, but the earliest unacked packet has been Acknowledged or</span></div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno">  160</span><span class="comment">       * Dropped; an In-flight packet remains.  In all reasonable algorithms the timer has to be</span></div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno">  161</span><span class="comment">       * restarted in this situation.  RFC 6298 and common sense support this.</span></div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno">  162</span><span class="comment">       *</span></div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno">  163</span><span class="comment">       * (Otherwise suppose I&#39;ve sent packets 1-10, one after the previous with 1 second between them.</span></div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno">  164</span><span class="comment">       * Thus I started timer at time 0 (when packet 1 was sent, since it was the first packet to be</span></div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno">  165</span><span class="comment">       * sent) and sent packet 10 ten seconds later.  Suppose DTO is 30 seconds, a second passes since</span></div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno">  166</span><span class="comment">       * packet 10 is passed, and packet 1 is acked.  If I don&#39;t restart the timer now, then that</span></div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno">  167</span><span class="comment">       * means (for example) packet 10 will have had ~10 seconds less (overall, relative to send time)</span></div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno">  168</span><span class="comment">       * than packet 1 before being Dropped.  This violates the RFC 6299 section 5 rule that the</span></div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno">  169</span><span class="comment">       * algorithm MUST allow at least a full RTO (DTO) since a given packet is sent before dropping</span></div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno">  170</span><span class="comment">       * that packet.) */</span></div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno">  171</span>      <a class="code hl_function" href="classflow_1_1net__flow_1_1Drop__timer.html#ad655d5461aa5a6bf9a80d28e4a4fdd77">disable_timer</a>();</div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno">  172</span>      <a class="code hl_function" href="classflow_1_1net__flow_1_1Drop__timer.html#a4a5f0bbb91232e17e258722e4dfa237b">start_timer</a>();</div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno">  173</span>    }</div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno">  174</span>    <span class="keywordflow">else</span> <span class="keywordflow">if</span> (<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a0d90b548d2c7062e1ac88b998a2fc1d5">m_during_events_newest_acked_packet</a> != 0)</div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno">  175</span>    {</div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno">  176</span>      <span class="comment">/* We have detected an out-of-order acknowledgment, which may mean we should restart time.</span></div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno">  177</span><span class="comment">       * Let&#39;s discuss in detail.</span></div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno">  178</span><span class="comment">       *</span></div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno">  179</span><span class="comment">       * Firstly, note that unlike various cases covered so far, this situation is NOT mutually exclusive w/r/t</span></div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno">  180</span><span class="comment">       * the pipe-left-edge-moved-right situation covered just above.  However, since the potential action</span></div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno">  181</span><span class="comment">       * for both situations is to restart the timer, it would be pointless to check for the 2nd event, if the</span></div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno">  182</span><span class="comment">       * 1st is already true. So that&#39;s why it&#39;s an &#39;else if.&#39;  So, from now on, assert that in fact</span></div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno">  183</span><span class="comment">       * at_events_end_oldest_packet == m_at_events_start_oldest_flying_packet.  In fact this makes the following</span></div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno">  184</span><span class="comment">       * reasoning quite simple vs. the alternative (had we not asserted that).</span></div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno">  185</span><span class="comment">       *</span></div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno">  186</span><span class="comment">       * Now, for what did we just check? 0 != m_during_events_newest_acked_packet</span></div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno">  187</span><span class="comment">       * means that, during the events group, the pipe&#39;s left edge did not move (previous paragraph again), but</span></div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno">  188</span><span class="comment">       * _a_ packet in the pipe was acknowledged (it must therefore no longer be in pipe). In fact this packet</span></div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno">  189</span><span class="comment">       * was &quot;to the right of&quot; (sent more recently than) that left-edge packet.</span></div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno">  190</span><span class="comment">       * This means at least one packet was acknowledged, but it wasn&#39;t the one that&#39;s &quot;due&quot; for acknowledgment</span></div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno">  191</span><span class="comment">       * (namely the packet m_at_events_start_oldest_flying_packet == at_events_end_oldest_packet).  So what do</span></div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno">  192</span><span class="comment">       * we do based on this information?</span></div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno">  193</span><span class="comment">       *</span></div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno">  194</span><span class="comment">       * We can do one of two things here: (1) nothing (let timer run); or (2) restart the timer.</span></div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno">  195</span><span class="comment">       * To be clear, (1) comes from a certain classic RFC mentioned just below. We can either follow that RFC&#39;s</span></div>
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno">  196</span><span class="comment">       * recommendatio (restart timer here) or not (do nothing). Here are the arguments for each:</span></div>
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno">  197</span><span class="comment">       *</span></div>
<div class="line"><a id="l00198" name="l00198"></a><span class="lineno">  198</span><span class="comment">       *   -1- Action: Let timer run (thus giving the earliest packet no recourse: do not follow RFC):</span></div>
<div class="line"><a id="l00199" name="l00199"></a><span class="lineno">  199</span><span class="comment">       *</span></div>
<div class="line"><a id="l00200" name="l00200"></a><span class="lineno">  200</span><span class="comment">       *   Pro: If we assume that, essentially, we&#39;re simulating a DTO for each individual packet,</span></div>
<div class="line"><a id="l00201" name="l00201"></a><span class="lineno">  201</span><span class="comment">       *        then having received acknowledgment for some packet P in no way means that an earlier</span></div>
<div class="line"><a id="l00202" name="l00202"></a><span class="lineno">  202</span><span class="comment">       *        packet P&#39; was also acknowledged.  I.e., if our one timer is meant to apply to the</span></div>
<div class="line"><a id="l00203" name="l00203"></a><span class="lineno">  203</span><span class="comment">       *        next-to-be-dropped (earliest unacked) packet only -- since the other packets&#39; implied</span></div>
<div class="line"><a id="l00204" name="l00204"></a><span class="lineno">  204</span><span class="comment">       *        timers can only fire after that one -- then a later packet being acked doesn&#39;t negate</span></div>
<div class="line"><a id="l00205" name="l00205"></a><span class="lineno">  205</span><span class="comment">       *        the fate that the earliest packet is still outstanding.  In other words restarting the</span></div>
<div class="line"><a id="l00206" name="l00206"></a><span class="lineno">  206</span><span class="comment">       *        timer here is more lax than the &quot;Drop Timeout per individual packet&quot; setup, thus we</span></div>
<div class="line"><a id="l00207" name="l00207"></a><span class="lineno">  207</span><span class="comment">       *        are being more precise w/r/t to the concept of the timer by letting it run.</span></div>
<div class="line"><a id="l00208" name="l00208"></a><span class="lineno">  208</span><span class="comment">       *   Pro: RFC 6298-5.3 says &quot;[if] ACK is received that acknowledges new data, restart the</span></div>
<div class="line"><a id="l00209" name="l00209"></a><span class="lineno">  209</span><span class="comment">       *        retransmission timer.&quot;  This can be interpreted to mean a CUMULATIVE ACK that</span></div>
<div class="line"><a id="l00210" name="l00210"></a><span class="lineno">  210</span><span class="comment">       *        acknowledges new data, as opposed to an out-of-order SACK (which is what we have</span></div>
<div class="line"><a id="l00211" name="l00211"></a><span class="lineno">  211</span><span class="comment">       *        here).  I am not sure if the RFC means that.  But if it means the former (cumulative ack),</span></div>
<div class="line"><a id="l00212" name="l00212"></a><span class="lineno">  212</span><span class="comment">       *        then we&#39;re NOT going against the RFC, which is a pro... well, not a con at least.</span></div>
<div class="line"><a id="l00213" name="l00213"></a><span class="lineno">  213</span><span class="comment">       *   Con: Assuming the RFC section 5-RECOMMENDED algorithm *doest* mean that SACKs = acknowledging &quot;new</span></div>
<div class="line"><a id="l00214" name="l00214"></a><span class="lineno">  214</span><span class="comment">       *        data&quot; (quoting RFC) as well, then we are being MORE aggressive than the RFC algorithm -- and</span></div>
<div class="line"><a id="l00215" name="l00215"></a><span class="lineno">  215</span><span class="comment">       *        being more aggressive could be bad and/or wrong.</span></div>
<div class="line"><a id="l00216" name="l00216"></a><span class="lineno">  216</span><span class="comment">       *</span></div>
<div class="line"><a id="l00217" name="l00217"></a><span class="lineno">  217</span><span class="comment">       *   -2- Action: Restart the timer (thus giving the earliest packet a new lease on life: follow RFC):</span></div>
<div class="line"><a id="l00218" name="l00218"></a><span class="lineno">  218</span><span class="comment">       *</span></div>
<div class="line"><a id="l00219" name="l00219"></a><span class="lineno">  219</span><span class="comment">       *   Pro: RFC 6298-5.3 may mean that either an ACK or a SACK acknowledging any unacked</span></div>
<div class="line"><a id="l00220" name="l00220"></a><span class="lineno">  220</span><span class="comment">       *        packets (whether in-order or out-of-order) means we should restart the timer.  In that</span></div>
<div class="line"><a id="l00221" name="l00221"></a><span class="lineno">  221</span><span class="comment">       *        case we&#39;d be directly following the RFC if restarting the timer.</span></div>
<div class="line"><a id="l00222" name="l00222"></a><span class="lineno">  222</span><span class="comment">       *   Pro: Even if not, by restarting the timer we are being LESS aggressive than the RFC, which</span></div>
<div class="line"><a id="l00223" name="l00223"></a><span class="lineno">  223</span><span class="comment">       *        is explicitly allowed by the RFC (we MUST not give any packet less than the DTO time,</span></div>
<div class="line"><a id="l00224" name="l00224"></a><span class="lineno">  224</span><span class="comment">       *        but we may give it more).</span></div>
<div class="line"><a id="l00225" name="l00225"></a><span class="lineno">  225</span><span class="comment">       *   Con: Restarting the timer is more lax than the &quot;Drop Timeout per individual packet&quot;</span></div>
<div class="line"><a id="l00226" name="l00226"></a><span class="lineno">  226</span><span class="comment">       *        setup, and the latter has an aesthetically pleasant logic to it.</span></div>
<div class="line"><a id="l00227" name="l00227"></a><span class="lineno">  227</span><span class="comment">       *</span></div>
<div class="line"><a id="l00228" name="l00228"></a><span class="lineno">  228</span><span class="comment">       * Therefore we make this configurable behavior.  When in doubt and without experimental backup,</span></div>
<div class="line"><a id="l00229" name="l00229"></a><span class="lineno">  229</span><span class="comment">       * do go for the less aggressive option (Restart the timer).</span></div>
<div class="line"><a id="l00230" name="l00230"></a><span class="lineno">  230</span><span class="comment">       *</span></div>
<div class="line"><a id="l00231" name="l00231"></a><span class="lineno">  231</span><span class="comment">       * @todo We didn&#39;t have to keep track of m_during_events_newest_acked_packet (the most-recently-sent</span></div>
<div class="line"><a id="l00232" name="l00232"></a><span class="lineno">  232</span><span class="comment">       * packet to be acked).  We could have just replaced it with bool m_during_events_ack_occurred, starting at false</span></div>
<div class="line"><a id="l00233" name="l00233"></a><span class="lineno">  233</span><span class="comment">       * but set to true in any on_ack().  Since a (valid) ack always subsequently removes that packet from</span></div>
<div class="line"><a id="l00234" name="l00234"></a><span class="lineno">  234</span><span class="comment">       * m_flying_packets, m_at_events_start_oldest_flying_packet still being in m_flying_packets implies that a packet</span></div>
<div class="line"><a id="l00235" name="l00235"></a><span class="lineno">  235</span><span class="comment">       * other than the left-most one was in fact acked... which is all we are lookig for in the first place.  However,</span></div>
<div class="line"><a id="l00236" name="l00236"></a><span class="lineno">  236</span><span class="comment">       * keeping the packet ID allows us to, at least, sanity-check some things via assert().  We can also log some</span></div>
<div class="line"><a id="l00237" name="l00237"></a><span class="lineno">  237</span><span class="comment">       * arguably useful packet IDs, e.g., in on_ack().  So arguably it&#39;s worth keeping.  The performance cost looks</span></div>
<div class="line"><a id="l00238" name="l00238"></a><span class="lineno">  238</span><span class="comment">       * minor (though this has not been profiled). */</span></div>
<div class="line"><a id="l00239" name="l00239"></a><span class="lineno">  239</span> </div>
<div class="line"><a id="l00240" name="l00240"></a><span class="lineno">  240</span>      <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Drop_timer [&quot;</span> &lt;&lt; <span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: out of order acknowledgment detected.&quot;</span>);</div>
<div class="line"><a id="l00241" name="l00241"></a><span class="lineno">  241</span> </div>
<div class="line"><a id="l00242" name="l00242"></a><span class="lineno">  242</span>      <span class="comment">// The following are all sanity checks to ensure situation is what we&#39;ve reasoned out in comment just above.</span></div>
<div class="line"><a id="l00243" name="l00243"></a><span class="lineno">  243</span>      assert(at_events_end_oldest_packet == <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a2ae6617225acb8c4b0798f113c1827d0">m_at_events_start_oldest_flying_packet</a>);</div>
<div class="line"><a id="l00244" name="l00244"></a><span class="lineno">  244</span>      assert(at_events_end_oldest_packet &lt; <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a0d90b548d2c7062e1ac88b998a2fc1d5">m_during_events_newest_acked_packet</a>);</div>
<div class="line"><a id="l00245" name="l00245"></a><span class="lineno">  245</span>      assert(!<a class="code hl_function" href="namespaceflow_1_1util.html#a03984e29450abf9cf287c501d6c8f866">util::key_exists</a>(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a83bacd0cfe7c6fb6349688012d472f1f">m_flying_packets</a>, <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a0d90b548d2c7062e1ac88b998a2fc1d5">m_during_events_newest_acked_packet</a>));</div>
<div class="line"><a id="l00246" name="l00246"></a><span class="lineno">  246</span> </div>
<div class="line"><a id="l00247" name="l00247"></a><span class="lineno">  247</span>      <span class="comment">/* An ACK acknowledged at least one packet, but the earliest (first) In-flight packet was NOT</span></div>
<div class="line"><a id="l00248" name="l00248"></a><span class="lineno">  248</span><span class="comment">       * acknowledged (and thus remains the earliest In-flight packet).</span></div>
<div class="line"><a id="l00249" name="l00249"></a><span class="lineno">  249</span><span class="comment">       *</span></div>
<div class="line"><a id="l00250" name="l00250"></a><span class="lineno">  250</span><span class="comment">       * We can do one of two things here: (1) nothing (let timer run); or (2) restart the timer.</span></div>
<div class="line"><a id="l00251" name="l00251"></a><span class="lineno">  251</span><span class="comment">       * Here are the arguments for each:</span></div>
<div class="line"><a id="l00252" name="l00252"></a><span class="lineno">  252</span><span class="comment">       *</span></div>
<div class="line"><a id="l00253" name="l00253"></a><span class="lineno">  253</span><span class="comment">       *   -1- Let timer run (thus giving the earliest packet no recourse):</span></div>
<div class="line"><a id="l00254" name="l00254"></a><span class="lineno">  254</span><span class="comment">       *</span></div>
<div class="line"><a id="l00255" name="l00255"></a><span class="lineno">  255</span><span class="comment">       *   Pro: RFC 6298-5.3 says &quot;ACK is received that acknowledges new data, restart the</span></div>
<div class="line"><a id="l00256" name="l00256"></a><span class="lineno">  256</span><span class="comment">       *        retransmission timer.&quot;  This can be interpreted to mean a CUMULATIVE ACK that</span></div>
<div class="line"><a id="l00257" name="l00257"></a><span class="lineno">  257</span><span class="comment">       *        acknowledges new data, as opposed to an out-of-order SACK (which is what we have</span></div>
<div class="line"><a id="l00258" name="l00258"></a><span class="lineno">  258</span><span class="comment">       *        here).  I am not sure if the RFC means that.</span></div>
<div class="line"><a id="l00259" name="l00259"></a><span class="lineno">  259</span><span class="comment">       *   Pro: If we assume that, essentially, we&#39;re simulating a DTO for each individual packet,</span></div>
<div class="line"><a id="l00260" name="l00260"></a><span class="lineno">  260</span><span class="comment">       *        then having received acknowledgment for some packet P in no way means that an earlier</span></div>
<div class="line"><a id="l00261" name="l00261"></a><span class="lineno">  261</span><span class="comment">       *        packet P&#39; was also acknowledged.  I.e., if our one timer is meant to apply to the</span></div>
<div class="line"><a id="l00262" name="l00262"></a><span class="lineno">  262</span><span class="comment">       *        next-to-be-dropped (earliest unacked) packet only -- since the other packets&#39; implied</span></div>
<div class="line"><a id="l00263" name="l00263"></a><span class="lineno">  263</span><span class="comment">       *        timers can only fire after that one -- then a later packet being acked doesn&#39;t negate</span></div>
<div class="line"><a id="l00264" name="l00264"></a><span class="lineno">  264</span><span class="comment">       *        the fate that the earliest packet is still outstanding.  In other words restarting the</span></div>
<div class="line"><a id="l00265" name="l00265"></a><span class="lineno">  265</span><span class="comment">       *        timer here is more lax than the &quot;Drop Timeout per individual packet&quot; setup, thus we</span></div>
<div class="line"><a id="l00266" name="l00266"></a><span class="lineno">  266</span><span class="comment">       *        are being more precise w/r/t to the concept of the timer by letting it run.</span></div>
<div class="line"><a id="l00267" name="l00267"></a><span class="lineno">  267</span><span class="comment">       *   Con: Assuming the RFC section 5 RECOMMENDED algorithm means that SACKs = acknowledging new</span></div>
<div class="line"><a id="l00268" name="l00268"></a><span class="lineno">  268</span><span class="comment">       *        data as well, then we are being MORE aggressive than the RFC algorithm which could be</span></div>
<div class="line"><a id="l00269" name="l00269"></a><span class="lineno">  269</span><span class="comment">       *        bad/incorrect.</span></div>
<div class="line"><a id="l00270" name="l00270"></a><span class="lineno">  270</span><span class="comment">       *</span></div>
<div class="line"><a id="l00271" name="l00271"></a><span class="lineno">  271</span><span class="comment">       *   -2- Restart the timer (thus giving the earliest packet a new lease on life):</span></div>
<div class="line"><a id="l00272" name="l00272"></a><span class="lineno">  272</span><span class="comment">       *</span></div>
<div class="line"><a id="l00273" name="l00273"></a><span class="lineno">  273</span><span class="comment">       *   Pro: RFC 6298-5.3 may mean that either an ACK or a SACK acknowledging any unacked</span></div>
<div class="line"><a id="l00274" name="l00274"></a><span class="lineno">  274</span><span class="comment">       *        packets (whether in-order or out-of-order) means we should restart the timer.  In that</span></div>
<div class="line"><a id="l00275" name="l00275"></a><span class="lineno">  275</span><span class="comment">       *        case we&#39;d be directly following the RFC if restarting the timer.</span></div>
<div class="line"><a id="l00276" name="l00276"></a><span class="lineno">  276</span><span class="comment">       *   Pro: Even if not, by restarting the timer we are being LESS aggressive than the RFC, which</span></div>
<div class="line"><a id="l00277" name="l00277"></a><span class="lineno">  277</span><span class="comment">       *        is explicitly allowed by the RFC (we MUST not give any packet less than the DTO time,</span></div>
<div class="line"><a id="l00278" name="l00278"></a><span class="lineno">  278</span><span class="comment">       *        but we may give it more).</span></div>
<div class="line"><a id="l00279" name="l00279"></a><span class="lineno">  279</span><span class="comment">       *   Con: Restarting the timer is more lax than the &quot;Drop Timeout per individual packet&quot;</span></div>
<div class="line"><a id="l00280" name="l00280"></a><span class="lineno">  280</span><span class="comment">       *        setup, and the latter has an aesthetically pleasant logic to it.</span></div>
<div class="line"><a id="l00281" name="l00281"></a><span class="lineno">  281</span><span class="comment">       *</span></div>
<div class="line"><a id="l00282" name="l00282"></a><span class="lineno">  282</span><span class="comment">       * Therefore we make this configurable behavior.  When in doubt and without experimental backup,</span></div>
<div class="line"><a id="l00283" name="l00283"></a><span class="lineno">  283</span><span class="comment">       * do go for the less aggressive option (Restart the timer). */</span></div>
<div class="line"><a id="l00284" name="l00284"></a><span class="lineno">  284</span>      <span class="keywordflow">if</span> (<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a7ab957ddc07d6289d1b42d6686173533">m_sock</a>-&gt;opt(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a7ab957ddc07d6289d1b42d6686173533">m_sock</a>-&gt;m_opts.m_st_out_of_order_ack_restarts_drop_timer))</div>
<div class="line"><a id="l00285" name="l00285"></a><span class="lineno">  285</span>      {</div>
<div class="line"><a id="l00286" name="l00286"></a><span class="lineno">  286</span>        <a class="code hl_function" href="classflow_1_1net__flow_1_1Drop__timer.html#ad655d5461aa5a6bf9a80d28e4a4fdd77">disable_timer</a>();</div>
<div class="line"><a id="l00287" name="l00287"></a><span class="lineno">  287</span>        <a class="code hl_function" href="classflow_1_1net__flow_1_1Drop__timer.html#a4a5f0bbb91232e17e258722e4dfa237b">start_timer</a>();</div>
<div class="line"><a id="l00288" name="l00288"></a><span class="lineno">  288</span>      }</div>
<div class="line"><a id="l00289" name="l00289"></a><span class="lineno">  289</span>    } <span class="comment">// else if (m_during_events_newest_acked_packet != 0)</span></div>
<div class="line"><a id="l00290" name="l00290"></a><span class="lineno">  290</span>  } <span class="comment">// if (m_flying_packets.empty() was false -- and still is)</span></div>
<div class="line"><a id="l00291" name="l00291"></a><span class="lineno">  291</span>} <span class="comment">// Drop_timer::end_contemporaneous_events()</span></div>
<div class="line"><a id="l00292" name="l00292"></a><span class="lineno">  292</span> </div>
<div class="line"><a id="l00293" name="l00293"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Drop__timer.html#a9c94b0191a80afb98b6da4a2d0b47a46">  293</a></span><a class="code hl_function" href="classflow_1_1net__flow_1_1Drop__timer.html#a9c94b0191a80afb98b6da4a2d0b47a46">Drop_timer::Drop_timer</a>(<a class="code hl_class" href="classflow_1_1log_1_1Logger.html">log::Logger</a>* logger_ptr,</div>
<div class="line"><a id="l00294" name="l00294"></a><span class="lineno">  294</span>                       <a class="code hl_typedef" href="namespaceflow_1_1util.html#ac3e89a8a271b0ddc76ac2a0ce488dea4">util::Task_engine</a>* node_task_engine,</div>
<div class="line"><a id="l00295" name="l00295"></a><span class="lineno">  295</span>                       <a class="code hl_typedef" href="namespaceflow.html#a48799f1263cdeedec125be51a3db2b79">Fine_duration</a>* sock_drop_timeout,</div>
<div class="line"><a id="l00296" name="l00296"></a><span class="lineno">  296</span>                       <a class="code hl_typedef" href="classflow_1_1util_1_1Shared__ptr__alias__holder.html#aef7998db71c60eeb5d1e3d1a97c14886">Peer_socket::Const_ptr</a>&amp;&amp; sock,</div>
<div class="line"><a id="l00297" name="l00297"></a><span class="lineno">  297</span>                       <span class="keyword">const</span> <a class="code hl_class" href="classflow_1_1Function.html">Function</a>&lt;<span class="keywordtype">void</span> (<span class="keyword">const</span> <a class="code hl_typedef" href="namespaceflow.html#a29eaaa9d0fac4ce87d8b969222dbed09">Error_code</a>&amp; err_code)&gt;&amp; timer_failure,</div>
<div class="line"><a id="l00298" name="l00298"></a><span class="lineno">  298</span>                       <span class="keyword">const</span> <a class="code hl_class" href="classflow_1_1Function.html">Function</a>&lt;<span class="keywordtype">void</span> (<span class="keywordtype">bool</span> drop_all_packets)&gt;&amp; timer_fired) :</div>
<div class="line"><a id="l00299" name="l00299"></a><span class="lineno">  299</span>  log::Log_context(logger_ptr, <a class="code hl_enumeration" href="namespaceflow.html#a3938730ab4b89daf13d027a5f620e7ce">Flow_log_component</a>::S_NET_FLOW),</div>
<div class="line"><a id="l00300" name="l00300"></a><span class="lineno">  300</span>  m_node_task_engine(*node_task_engine),</div>
<div class="line"><a id="l00301" name="l00301"></a><span class="lineno">  301</span>  m_sock_drop_timeout(*sock_drop_timeout),</div>
<div class="line"><a id="l00302" name="l00302"></a><span class="lineno">  302</span>  m_sock(std::move(sock)),</div>
<div class="line"><a id="l00303" name="l00303"></a><span class="lineno">  303</span>  m_timer(m_node_task_engine),</div>
<div class="line"><a id="l00304" name="l00304"></a><span class="lineno">  304</span>  m_timer_running(false),</div>
<div class="line"><a id="l00305" name="l00305"></a><span class="lineno">  305</span>  m_current_wait_id(0),</div>
<div class="line"><a id="l00306" name="l00306"></a><span class="lineno">  306</span>  m_done(false),</div>
<div class="line"><a id="l00307" name="l00307"></a><span class="lineno">  307</span>  m_timer_failure(timer_failure),</div>
<div class="line"><a id="l00308" name="l00308"></a><span class="lineno">  308</span>  m_timer_fired(timer_fired),</div>
<div class="line"><a id="l00309" name="l00309"></a><span class="lineno">  309</span>  m_at_events_start_oldest_flying_packet(0),</div>
<div class="line"><a id="l00310" name="l00310"></a><span class="lineno">  310</span>  m_during_events_newest_acked_packet(0),</div>
<div class="line"><a id="l00311" name="l00311"></a><span class="lineno">  311</span>  m_in_events_group(false)</div>
<div class="line"><a id="l00312" name="l00312"></a><span class="lineno">  312</span>{</div>
<div class="line"><a id="l00313" name="l00313"></a><span class="lineno">  313</span>  <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Drop_timer [&quot;</span> &lt;&lt; <span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;] created.&quot;</span>);</div>
<div class="line"><a id="l00314" name="l00314"></a><span class="lineno">  314</span>}</div>
<div class="line"><a id="l00315" name="l00315"></a><span class="lineno">  315</span> </div>
<div class="line"><a id="l00316" name="l00316"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Drop__timer.html#a60e386c24490bd5880e9e8700e59ca6d">  316</a></span><a class="code hl_function" href="classflow_1_1net__flow_1_1Drop__timer.html#a60e386c24490bd5880e9e8700e59ca6d">Drop_timer::~Drop_timer</a>()</div>
<div class="line"><a id="l00317" name="l00317"></a><span class="lineno">  317</span>{</div>
<div class="line"><a id="l00318" name="l00318"></a><span class="lineno">  318</span>  <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Drop_timer [&quot;</span> &lt;&lt; <span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;] destroyed.&quot;</span>);</div>
<div class="line"><a id="l00319" name="l00319"></a><span class="lineno">  319</span>}</div>
<div class="line"><a id="l00320" name="l00320"></a><span class="lineno">  320</span> </div>
<div class="line"><a id="l00321" name="l00321"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Drop__timer.html#ab6b96e0200579afdee1bf1ce58ab5ad2">  321</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Drop__timer.html#ab6b96e0200579afdee1bf1ce58ab5ad2">Drop_timer::done</a>()</div>
<div class="line"><a id="l00322" name="l00322"></a><span class="lineno">  322</span>{</div>
<div class="line"><a id="l00323" name="l00323"></a><span class="lineno">  323</span>  <span class="keywordflow">if</span> (<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a9de653d7372110ffd176ef34e916a7dd">m_done</a>)</div>
<div class="line"><a id="l00324" name="l00324"></a><span class="lineno">  324</span>  {</div>
<div class="line"><a id="l00325" name="l00325"></a><span class="lineno">  325</span>    <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00326" name="l00326"></a><span class="lineno">  326</span>  }</div>
<div class="line"><a id="l00327" name="l00327"></a><span class="lineno">  327</span> </div>
<div class="line"><a id="l00328" name="l00328"></a><span class="lineno">  328</span>  <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Drop_timer [&quot;</span> &lt;&lt; <span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;] permanently disabled.&quot;</span>);</div>
<div class="line"><a id="l00329" name="l00329"></a><span class="lineno">  329</span> </div>
<div class="line"><a id="l00330" name="l00330"></a><span class="lineno">  330</span>  <span class="keywordflow">if</span> (<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a9528326a35b021bb859bed948ae3d7a4">m_timer_running</a>)</div>
<div class="line"><a id="l00331" name="l00331"></a><span class="lineno">  331</span>  {</div>
<div class="line"><a id="l00332" name="l00332"></a><span class="lineno">  332</span>    <span class="comment">// If timer is scheduled, expedite it firing.</span></div>
<div class="line"><a id="l00333" name="l00333"></a><span class="lineno">  333</span>    <a class="code hl_function" href="classflow_1_1net__flow_1_1Drop__timer.html#ad655d5461aa5a6bf9a80d28e4a4fdd77">disable_timer</a>();</div>
<div class="line"><a id="l00334" name="l00334"></a><span class="lineno">  334</span>  }</div>
<div class="line"><a id="l00335" name="l00335"></a><span class="lineno">  335</span>  <span class="comment">// Short-circuit any subsequent callbacks to immediately return.</span></div>
<div class="line"><a id="l00336" name="l00336"></a><span class="lineno">  336</span>  <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a9de653d7372110ffd176ef34e916a7dd">m_done</a> = <span class="keyword">true</span>;</div>
<div class="line"><a id="l00337" name="l00337"></a><span class="lineno">  337</span> </div>
<div class="line"><a id="l00338" name="l00338"></a><span class="lineno">  338</span>  <span class="comment">/* These function &quot;pointers&quot; will be &quot;pointing&quot; to some function objects that are holding</span></div>
<div class="line"><a id="l00339" name="l00339"></a><span class="lineno">  339</span><span class="comment">   * arguments to the underlying methods to call, via labmda or bind().  These arguments will include</span></div>
<div class="line"><a id="l00340" name="l00340"></a><span class="lineno">  340</span><span class="comment">   * such resources as Peer_socket::Ptr.  Clear the &quot;pointers&quot; to delete the function objects, thus</span></div>
<div class="line"><a id="l00341" name="l00341"></a><span class="lineno">  341</span><span class="comment">   * letting those resources expire (in case of Ptr, let the underlying Peer_socket&#39;s ref-count get</span></div>
<div class="line"><a id="l00342" name="l00342"></a><span class="lineno">  342</span><span class="comment">   * decremented, avoiding a memory leak). */</span></div>
<div class="line"><a id="l00343" name="l00343"></a><span class="lineno">  343</span>  <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a21e78b9da6196043e1c05589c46911fa">m_timer_failure</a>.clear();</div>
<div class="line"><a id="l00344" name="l00344"></a><span class="lineno">  344</span>  <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a862595a7ec5d4bea05ad0e85c52e88ac">m_timer_fired</a>.clear();</div>
<div class="line"><a id="l00345" name="l00345"></a><span class="lineno">  345</span>}</div>
<div class="line"><a id="l00346" name="l00346"></a><span class="lineno">  346</span> </div>
<div class="line"><a id="l00347" name="l00347"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Drop__timer.html#a4a5f0bbb91232e17e258722e4dfa237b">  347</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Drop__timer.html#a4a5f0bbb91232e17e258722e4dfa237b">Drop_timer::start_timer</a>()</div>
<div class="line"><a id="l00348" name="l00348"></a><span class="lineno">  348</span>{</div>
<div class="line"><a id="l00349" name="l00349"></a><span class="lineno">  349</span>  <span class="keyword">using </span><a class="code hl_enumeration" href="namespaceflow_1_1log.html#a5c602384e6fe9d7642740ac2fae4ad04">log::Sev</a>;</div>
<div class="line"><a id="l00350" name="l00350"></a><span class="lineno">  350</span>  <span class="keyword">using </span>boost::asio::post;</div>
<div class="line"><a id="l00351" name="l00351"></a><span class="lineno">  351</span>  <span class="keyword">using </span>boost::chrono::microseconds;</div>
<div class="line"><a id="l00352" name="l00352"></a><span class="lineno">  352</span>  <span class="keyword">using </span>boost::chrono::milliseconds;</div>
<div class="line"><a id="l00353" name="l00353"></a><span class="lineno">  353</span>  <span class="keyword">using </span>boost::chrono::round;</div>
<div class="line"><a id="l00354" name="l00354"></a><span class="lineno">  354</span> </div>
<div class="line"><a id="l00355" name="l00355"></a><span class="lineno">  355</span>  <span class="comment">// Explicitly documented pre-condition.</span></div>
<div class="line"><a id="l00356" name="l00356"></a><span class="lineno">  356</span>  assert(!<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a9528326a35b021bb859bed948ae3d7a4">m_timer_running</a>);</div>
<div class="line"><a id="l00357" name="l00357"></a><span class="lineno">  357</span> </div>
<div class="line"><a id="l00358" name="l00358"></a><span class="lineno">  358</span>  <span class="comment">/* Determine when the timer will fire.  Due to the interface of Timer, we need either a</span></div>
<div class="line"><a id="l00359" name="l00359"></a><span class="lineno">  359</span><span class="comment">   * Fine_duration (for expires_after()) or a Fine_time_pt (for expires_at()): how long from now,</span></div>
<div class="line"><a id="l00360" name="l00360"></a><span class="lineno">  360</span><span class="comment">   * or when in absolute terms, respectively.</span></div>
<div class="line"><a id="l00361" name="l00361"></a><span class="lineno">  361</span><span class="comment">   *</span></div>
<div class="line"><a id="l00362" name="l00362"></a><span class="lineno">  362</span><span class="comment">   * The obvious first choice would be simply the DTO from now, so</span></div>
<div class="line"><a id="l00363" name="l00363"></a><span class="lineno">  363</span><span class="comment">   * expires_after(m_sock_drop_timeout), where the latter is a Fine_duration.</span></div>
<div class="line"><a id="l00364" name="l00364"></a><span class="lineno">  364</span><span class="comment">   *</span></div>
<div class="line"><a id="l00365" name="l00365"></a><span class="lineno">  365</span><span class="comment">   * A more complex setup we may want is: the timer firing in m_sock_drop_timeout time units since the time</span></div>
<div class="line"><a id="l00366" name="l00366"></a><span class="lineno">  366</span><span class="comment">   * of the earliest (first) current In-flight packet was sent.  Call that initial time point P.  (P is a</span></div>
<div class="line"><a id="l00367" name="l00367"></a><span class="lineno">  367</span><span class="comment">   * Fine_time_pt.)  So this is: expires_at(P + m_sock_drop_timeout), where the terms are Fine_time_pt</span></div>
<div class="line"><a id="l00368" name="l00368"></a><span class="lineno">  368</span><span class="comment">   * and Fine_duration, respectively.</span></div>
<div class="line"><a id="l00369" name="l00369"></a><span class="lineno">  369</span><span class="comment">   *</span></div>
<div class="line"><a id="l00370" name="l00370"></a><span class="lineno">  370</span><span class="comment">   * So which one should we use?  RFC 6298 says use RTO (our DTO) from the current time.  This is also the</span></div>
<div class="line"><a id="l00371" name="l00371"></a><span class="lineno">  371</span><span class="comment">   * less aggressive choice, towards which the RFC is generally biased.  On the other hand, if we want to give</span></div>
<div class="line"><a id="l00372" name="l00372"></a><span class="lineno">  372</span><span class="comment">   * each given packet no less and NO MORE than DTO before Dropping, then we&#39;d use the other policy. So, it&#39;s</span></div>
<div class="line"><a id="l00373" name="l00373"></a><span class="lineno">  373</span><span class="comment">   * configurable.  However when in doubt and in the absence of experimental data go with the less aggressive</span></div>
<div class="line"><a id="l00374" name="l00374"></a><span class="lineno">  374</span><span class="comment">   * option, which is to just fire DTO from now, as opposed to from P. */</span></div>
<div class="line"><a id="l00375" name="l00375"></a><span class="lineno">  375</span> </div>
<div class="line"><a id="l00376" name="l00376"></a><span class="lineno">  376</span>  <span class="comment">/* The time point of firing is either duration from now(), or absolute time point.  The former is still</span></div>
<div class="line"><a id="l00377" name="l00377"></a><span class="lineno">  377</span><span class="comment">   * computed for logging even if not used directly. */</span></div>
<div class="line"><a id="l00378" name="l00378"></a><span class="lineno">  378</span>  <a class="code hl_typedef" href="namespaceflow.html#a48799f1263cdeedec125be51a3db2b79">Fine_duration</a> fire_duration_vs_now; <span class="comment">// Caution!  This is uninitialized.</span></div>
<div class="line"><a id="l00379" name="l00379"></a><span class="lineno">  379</span>  <a class="code hl_typedef" href="namespaceflow.html#a9d9cc2eeb10d398cff5591d446b763b8">Fine_time_pt</a> fire_time_pt;</div>
<div class="line"><a id="l00380" name="l00380"></a><span class="lineno">  380</span>  <span class="keywordtype">bool</span> use_time_pt_over_duration;</div>
<div class="line"><a id="l00381" name="l00381"></a><span class="lineno">  381</span>  <span class="keywordflow">if</span> (<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a7ab957ddc07d6289d1b42d6686173533">m_sock</a>-&gt;opt(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a7ab957ddc07d6289d1b42d6686173533">m_sock</a>-&gt;m_opts.m_st_drop_packet_exactly_after_drop_timeout))</div>
<div class="line"><a id="l00382" name="l00382"></a><span class="lineno">  382</span>  {</div>
<div class="line"><a id="l00383" name="l00383"></a><span class="lineno">  383</span>    <span class="comment">// The more aggressive choice.  Fire in DTO but adjust by the time that has passed since earliest packet sent.</span></div>
<div class="line"><a id="l00384" name="l00384"></a><span class="lineno">  384</span> </div>
<div class="line"><a id="l00385" name="l00385"></a><span class="lineno">  385</span>    <span class="comment">// Get time when earliest packet sent.</span></div>
<div class="line"><a id="l00386" name="l00386"></a><span class="lineno">  386</span>    assert(!<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a7ab957ddc07d6289d1b42d6686173533">m_sock</a>-&gt;m_snd_flying_pkts_by_sent_when.empty()); <span class="comment">// Timer must not be started when no packets In-flight.</span></div>
<div class="line"><a id="l00387" name="l00387"></a><span class="lineno">  387</span>    <span class="keyword">const</span> <a class="code hl_typedef" href="namespaceflow.html#a9d9cc2eeb10d398cff5591d446b763b8">Fine_time_pt</a>&amp; first_packet_sent_when</div>
<div class="line"><a id="l00388" name="l00388"></a><span class="lineno">  388</span>      = <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a7ab957ddc07d6289d1b42d6686173533">m_sock</a>-&gt;m_snd_flying_pkts_by_sent_when.const_back().second-&gt;m_sent_when.back().m_sent_time;</div>
<div class="line"><a id="l00389" name="l00389"></a><span class="lineno">  389</span> </div>
<div class="line"><a id="l00390" name="l00390"></a><span class="lineno">  390</span>    fire_time_pt = first_packet_sent_when + <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#ad9db83f50aec60604de55d01e15ea403">m_sock_drop_timeout</a>;</div>
<div class="line"><a id="l00391" name="l00391"></a><span class="lineno">  391</span>    use_time_pt_over_duration = <span class="keyword">true</span>;</div>
<div class="line"><a id="l00392" name="l00392"></a><span class="lineno">  392</span> </div>
<div class="line"><a id="l00393" name="l00393"></a><span class="lineno">  393</span>    <span class="comment">// Compute firing time for logging (skip it if logging macro will not actually log it though).</span></div>
<div class="line"><a id="l00394" name="l00394"></a><span class="lineno">  394</span>    <span class="keyword">auto</span> <span class="keyword">const</span> logger_ptr = <a class="code hl_function" href="classflow_1_1log_1_1Log__context.html#af4db395042b065b00398cd59845dcb4d">get_logger</a>();</div>
<div class="line"><a id="l00395" name="l00395"></a><span class="lineno">  395</span>    <span class="keywordflow">if</span> (logger_ptr &amp;&amp; logger_ptr-&gt;<a class="code hl_function" href="classflow_1_1log_1_1Logger.html#ac8a2e7a33fe3fbc0c29ead62ed98c022">should_log</a>(Sev::S_TRACE, <a class="code hl_function" href="classflow_1_1log_1_1Log__context.html#a8a5fef42dc2cedf3c0d1a6e83beb2948">get_log_component</a>()))</div>
<div class="line"><a id="l00396" name="l00396"></a><span class="lineno">  396</span>    {</div>
<div class="line"><a id="l00397" name="l00397"></a><span class="lineno">  397</span>      fire_duration_vs_now = fire_time_pt - Fine_clock::now();</div>
<div class="line"><a id="l00398" name="l00398"></a><span class="lineno">  398</span>    }</div>
<div class="line"><a id="l00399" name="l00399"></a><span class="lineno">  399</span>  }</div>
<div class="line"><a id="l00400" name="l00400"></a><span class="lineno">  400</span>  <span class="keywordflow">else</span></div>
<div class="line"><a id="l00401" name="l00401"></a><span class="lineno">  401</span>  {</div>
<div class="line"><a id="l00402" name="l00402"></a><span class="lineno">  402</span>    <span class="comment">// The less aggressive choice.  Just fire in DTO time units.</span></div>
<div class="line"><a id="l00403" name="l00403"></a><span class="lineno">  403</span>    fire_duration_vs_now = <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#ad9db83f50aec60604de55d01e15ea403">m_sock_drop_timeout</a>;</div>
<div class="line"><a id="l00404" name="l00404"></a><span class="lineno">  404</span>    use_time_pt_over_duration = <span class="keyword">false</span>;</div>
<div class="line"><a id="l00405" name="l00405"></a><span class="lineno">  405</span>  }</div>
<div class="line"><a id="l00406" name="l00406"></a><span class="lineno">  406</span> </div>
<div class="line"><a id="l00407" name="l00407"></a><span class="lineno">  407</span>  <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Drop_timer [&quot;</span> &lt;&lt; <span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;] setting timer to &quot;</span></div>
<div class="line"><a id="l00408" name="l00408"></a><span class="lineno">  408</span>                 <span class="stringliteral">&quot;[&quot;</span> &lt;&lt; round&lt;milliseconds&gt;(fire_duration_vs_now) &lt;&lt; <span class="stringliteral">&quot;] from now; &quot;</span></div>
<div class="line"><a id="l00409" name="l00409"></a><span class="lineno">  409</span>                 <span class="stringliteral">&quot;wait_id = [&quot;</span> &lt;&lt; (<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#aa9af1ac250a1a40f3c8df5878e55b98c">m_current_wait_id</a> + 1) &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00410" name="l00410"></a><span class="lineno">  410</span> </div>
<div class="line"><a id="l00411" name="l00411"></a><span class="lineno">  411</span>  <span class="comment">/* Note that fire_duration_vs_now may be somewhat negative, particularly in the</span></div>
<div class="line"><a id="l00412" name="l00412"></a><span class="lineno">  412</span><span class="comment">   * m_st_drop_packet_exactly_after_drop_timeout case above after on_packet_no_longer_in_flight()&#39;s</span></div>
<div class="line"><a id="l00413" name="l00413"></a><span class="lineno">  413</span><span class="comment">   * if-left-most-In-flight-packet-has-shifted case.</span></div>
<div class="line"><a id="l00414" name="l00414"></a><span class="lineno">  414</span><span class="comment">   * That&#39;s fine: timer will just fire as soon as m_task_engine gets a chance.  It&#39;s no different</span></div>
<div class="line"><a id="l00415" name="l00415"></a><span class="lineno">  415</span><span class="comment">   * from it just firing really soon due to a short timeout.  Since each timer firing will cause</span></div>
<div class="line"><a id="l00416" name="l00416"></a><span class="lineno">  416</span><span class="comment">   * Node to Drop one packet, this chain of events will finish in short order once it runs out of</span></div>
<div class="line"><a id="l00417" name="l00417"></a><span class="lineno">  417</span><span class="comment">   * packets for which it should be firing. */</span></div>
<div class="line"><a id="l00418" name="l00418"></a><span class="lineno">  418</span> </div>
<div class="line"><a id="l00419" name="l00419"></a><span class="lineno">  419</span>  <span class="keyword">const</span> <span class="keyword">auto</span> this_ptr = shared_from_this();</div>
<div class="line"><a id="l00420" name="l00420"></a><span class="lineno">  420</span> </div>
<div class="line"><a id="l00421" name="l00421"></a><span class="lineno">  421</span>  <span class="comment">// Set the firing time decided above.</span></div>
<div class="line"><a id="l00422" name="l00422"></a><span class="lineno">  422</span>  use_time_pt_over_duration</div>
<div class="line"><a id="l00423" name="l00423"></a><span class="lineno">  423</span>    ? <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#ad5dfc3cd2f8e5e4d28c49e28ee5c221f">m_timer</a>.expires_at(fire_time_pt)</div>
<div class="line"><a id="l00424" name="l00424"></a><span class="lineno">  424</span>    : <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#ad5dfc3cd2f8e5e4d28c49e28ee5c221f">m_timer</a>.expires_after(fire_duration_vs_now);</div>
<div class="line"><a id="l00425" name="l00425"></a><span class="lineno">  425</span> </div>
<div class="line"><a id="l00426" name="l00426"></a><span class="lineno">  426</span>  <span class="comment">/* Call handle_timer_firing() asynchronously.  this_wait_id will be used to identify which start_timer() caused</span></div>
<div class="line"><a id="l00427" name="l00427"></a><span class="lineno">  427</span><span class="comment">   * that callback to fire.  this_ptr used as above. */</span></div>
<div class="line"><a id="l00428" name="l00428"></a><span class="lineno">  428</span>  <span class="keyword">const</span> <span class="keyword">auto</span> this_wait_id = ++<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#aa9af1ac250a1a40f3c8df5878e55b98c">m_current_wait_id</a>;</div>
<div class="line"><a id="l00429" name="l00429"></a><span class="lineno">  429</span>  <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#ad5dfc3cd2f8e5e4d28c49e28ee5c221f">m_timer</a>.async_wait([<span class="keyword">this</span>, this_ptr, this_wait_id](<span class="keyword">const</span> <a class="code hl_typedef" href="namespaceflow.html#a29eaaa9d0fac4ce87d8b969222dbed09">Error_code</a>&amp; sys_err_code)</div>
<div class="line"><a id="l00430" name="l00430"></a><span class="lineno">  430</span>  {</div>
<div class="line"><a id="l00431" name="l00431"></a><span class="lineno">  431</span>    <a class="code hl_function" href="classflow_1_1net__flow_1_1Drop__timer.html#aaf4f0fce1d41e16309beca40a126e2f0">handle_timer_firing</a>(this_ptr, this_wait_id, sys_err_code);</div>
<div class="line"><a id="l00432" name="l00432"></a><span class="lineno">  432</span>  });</div>
<div class="line"><a id="l00433" name="l00433"></a><span class="lineno">  433</span> </div>
<div class="line"><a id="l00434" name="l00434"></a><span class="lineno">  434</span>  <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a9528326a35b021bb859bed948ae3d7a4">m_timer_running</a> = <span class="keyword">true</span>;</div>
<div class="line"><a id="l00435" name="l00435"></a><span class="lineno">  435</span>} <span class="comment">// Drop_timer::start_timer()</span></div>
<div class="line"><a id="l00436" name="l00436"></a><span class="lineno">  436</span> </div>
<div class="line"><a id="l00437" name="l00437"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Drop__timer.html#ad655d5461aa5a6bf9a80d28e4a4fdd77">  437</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Drop__timer.html#ad655d5461aa5a6bf9a80d28e4a4fdd77">Drop_timer::disable_timer</a>()</div>
<div class="line"><a id="l00438" name="l00438"></a><span class="lineno">  438</span>{</div>
<div class="line"><a id="l00439" name="l00439"></a><span class="lineno">  439</span>  <span class="keyword">using </span>boost::chrono::milliseconds;</div>
<div class="line"><a id="l00440" name="l00440"></a><span class="lineno">  440</span>  <span class="keyword">using </span>boost::chrono::round;</div>
<div class="line"><a id="l00441" name="l00441"></a><span class="lineno">  441</span> </div>
<div class="line"><a id="l00442" name="l00442"></a><span class="lineno">  442</span>  <span class="comment">// Explicitly documented pre-condition.</span></div>
<div class="line"><a id="l00443" name="l00443"></a><span class="lineno">  443</span>  assert(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a9528326a35b021bb859bed948ae3d7a4">m_timer_running</a>);</div>
<div class="line"><a id="l00444" name="l00444"></a><span class="lineno">  444</span> </div>
<div class="line"><a id="l00445" name="l00445"></a><span class="lineno">  445</span>  <span class="comment">/* As discussed elsewhere, m_timer.cancel() is not enough to ensure handle_timer_firing() doesn&#39;t</span></div>
<div class="line"><a id="l00446" name="l00446"></a><span class="lineno">  446</span><span class="comment">   * get called; if the latter is already queued to fire right now then we won&#39;t be able stop it.</span></div>
<div class="line"><a id="l00447" name="l00447"></a><span class="lineno">  447</span><span class="comment">   * Moreover even if successful cancel() will still call handle_timer_firing() but with</span></div>
<div class="line"><a id="l00448" name="l00448"></a><span class="lineno">  448</span><span class="comment">   * operation_aborted Error_code.  That&#39;s why we set m_timer_running = false.</span></div>
<div class="line"><a id="l00449" name="l00449"></a><span class="lineno">  449</span><span class="comment">   * handle_timer_firing() will see that and do nothing, as if it had been canceled. */</span></div>
<div class="line"><a id="l00450" name="l00450"></a><span class="lineno">  450</span> </div>
<div class="line"><a id="l00451" name="l00451"></a><span class="lineno">  451</span>  <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Drop_timer [&quot;</span> &lt;&lt; <span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;] disabling; was set to fire in &quot;</span></div>
<div class="line"><a id="l00452" name="l00452"></a><span class="lineno">  452</span>                 <span class="stringliteral">&quot;[&quot;</span> &lt;&lt; round&lt;milliseconds&gt;(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#ad5dfc3cd2f8e5e4d28c49e28ee5c221f">m_timer</a>.expiry() - Fine_clock::now()) &lt;&lt; <span class="stringliteral">&quot;]; &quot;</span></div>
<div class="line"><a id="l00453" name="l00453"></a><span class="lineno">  453</span>                 <span class="stringliteral">&quot;wait_id = [&quot;</span> &lt;&lt; <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#aa9af1ac250a1a40f3c8df5878e55b98c">m_current_wait_id</a> &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00454" name="l00454"></a><span class="lineno">  454</span> </div>
<div class="line"><a id="l00455" name="l00455"></a><span class="lineno">  455</span>  <span class="comment">// Try to cancel any pending waits (call ASAP with err_code = operation_aborted).</span></div>
<div class="line"><a id="l00456" name="l00456"></a><span class="lineno">  456</span>  <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#ad5dfc3cd2f8e5e4d28c49e28ee5c221f">m_timer</a>.cancel();</div>
<div class="line"><a id="l00457" name="l00457"></a><span class="lineno">  457</span> </div>
<div class="line"><a id="l00458" name="l00458"></a><span class="lineno">  458</span>  <span class="comment">// Even if something was already queued, this will inform it that it was canceled.</span></div>
<div class="line"><a id="l00459" name="l00459"></a><span class="lineno">  459</span>  <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a9528326a35b021bb859bed948ae3d7a4">m_timer_running</a> = <span class="keyword">false</span>;</div>
<div class="line"><a id="l00460" name="l00460"></a><span class="lineno">  460</span>} <span class="comment">// Drop_timer::disable_timer()</span></div>
<div class="line"><a id="l00461" name="l00461"></a><span class="lineno">  461</span> </div>
<div class="line"><a id="l00462" name="l00462"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Drop__timer.html#aaf4f0fce1d41e16309beca40a126e2f0">  462</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Drop__timer.html#aaf4f0fce1d41e16309beca40a126e2f0">Drop_timer::handle_timer_firing</a>([[maybe_unused]] Ptr prevent_destruction,</div>
<div class="line"><a id="l00463" name="l00463"></a><span class="lineno">  463</span>                                     <a class="code hl_typedef" href="classflow_1_1net__flow_1_1Drop__timer.html#ad9db6f435dfc65b7bd4b539467f1c3ec">timer_wait_id_t</a> wait_id,</div>
<div class="line"><a id="l00464" name="l00464"></a><span class="lineno">  464</span>                                     <span class="keyword">const</span> <a class="code hl_typedef" href="namespaceflow.html#a29eaaa9d0fac4ce87d8b969222dbed09">Error_code</a>&amp; sys_err_code)</div>
<div class="line"><a id="l00465" name="l00465"></a><span class="lineno">  465</span>{</div>
<div class="line"><a id="l00466" name="l00466"></a><span class="lineno">  466</span>  <span class="keyword">using </span>std::min;</div>
<div class="line"><a id="l00467" name="l00467"></a><span class="lineno">  467</span>  <span class="keyword">using </span>boost::chrono::milliseconds;</div>
<div class="line"><a id="l00468" name="l00468"></a><span class="lineno">  468</span>  <span class="keyword">using </span>boost::chrono::round;</div>
<div class="line"><a id="l00469" name="l00469"></a><span class="lineno">  469</span> </div>
<div class="line"><a id="l00470" name="l00470"></a><span class="lineno">  470</span>  <span class="keywordflow">if</span> (<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a9de653d7372110ffd176ef34e916a7dd">m_done</a> <span class="comment">// done() called.</span></div>
<div class="line"><a id="l00471" name="l00471"></a><span class="lineno">  471</span>      || (sys_err_code == boost::asio::error::operation_aborted) <span class="comment">// disable_timer() called cancel() successfully.</span></div>
<div class="line"><a id="l00472" name="l00472"></a><span class="lineno">  472</span>      || (!<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a9528326a35b021bb859bed948ae3d7a4">m_timer_running</a>) <span class="comment">// cancel() was too late, but disable_timer() did try to cancel us nonetheless.</span></div>
<div class="line"><a id="l00473" name="l00473"></a><span class="lineno">  473</span>      || (<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#aa9af1ac250a1a40f3c8df5878e55b98c">m_current_wait_id</a> != wait_id)) <span class="comment">// Someone recently rescheduled timer, but we still fired from earlier.</span></div>
<div class="line"><a id="l00474" name="l00474"></a><span class="lineno">  474</span>  {</div>
<div class="line"><a id="l00475" name="l00475"></a><span class="lineno">  475</span>    <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Drop_timer [&quot;</span> &lt;&lt; <span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;] fired but obsolete/canceled; &quot;</span></div>
<div class="line"><a id="l00476" name="l00476"></a><span class="lineno">  476</span>                   <span class="stringliteral">&quot;done = [&quot;</span> &lt;&lt; <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a9de653d7372110ffd176ef34e916a7dd">m_done</a> &lt;&lt; <span class="stringliteral">&quot;]; &quot;</span></div>
<div class="line"><a id="l00477" name="l00477"></a><span class="lineno">  477</span>                   <span class="stringliteral">&quot;aborted = [&quot;</span> &lt;&lt; (sys_err_code == boost::asio::error::operation_aborted) &lt;&lt; <span class="stringliteral">&quot;]; &quot;</span></div>
<div class="line"><a id="l00478" name="l00478"></a><span class="lineno">  478</span>                   <span class="stringliteral">&quot;timer_running = [&quot;</span> &lt;&lt; <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a9528326a35b021bb859bed948ae3d7a4">m_timer_running</a> &lt;&lt; <span class="stringliteral">&quot;]; &quot;</span></div>
<div class="line"><a id="l00479" name="l00479"></a><span class="lineno">  479</span>                   <span class="stringliteral">&quot;wait_id = [&quot;</span> &lt;&lt; wait_id &lt;&lt; <span class="stringliteral">&quot;]; current_wait_id = [&quot;</span> &lt;&lt; <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#aa9af1ac250a1a40f3c8df5878e55b98c">m_current_wait_id</a> &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00480" name="l00480"></a><span class="lineno">  480</span>    <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00481" name="l00481"></a><span class="lineno">  481</span>  }</div>
<div class="line"><a id="l00482" name="l00482"></a><span class="lineno">  482</span>  <span class="comment">// else</span></div>
<div class="line"><a id="l00483" name="l00483"></a><span class="lineno">  483</span> </div>
<div class="line"><a id="l00484" name="l00484"></a><span class="lineno">  484</span>  <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Drop_timer [&quot;</span> &lt;&lt; <span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;] fired; wait_id = [&quot;</span> &lt;&lt; wait_id &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00485" name="l00485"></a><span class="lineno">  485</span> </div>
<div class="line"><a id="l00486" name="l00486"></a><span class="lineno">  486</span>  <span class="keywordflow">if</span> (sys_err_code)</div>
<div class="line"><a id="l00487" name="l00487"></a><span class="lineno">  487</span>  {</div>
<div class="line"><a id="l00488" name="l00488"></a><span class="lineno">  488</span>    <a class="code hl_define" href="error_2error_8hpp.html#a019ee6e90802e444572dd78d312d6e23">FLOW_ERROR_SYS_ERROR_LOG_WARNING</a>(); <span class="comment">// Log non-portable error.</span></div>
<div class="line"><a id="l00489" name="l00489"></a><span class="lineno">  489</span>    <span class="comment">// Nothing else to do here.  We don&#39;t know what this means.  So just treat it as if timer was triggered.</span></div>
<div class="line"><a id="l00490" name="l00490"></a><span class="lineno">  490</span>  }</div>
<div class="line"><a id="l00491" name="l00491"></a><span class="lineno">  491</span> </div>
<div class="line"><a id="l00492" name="l00492"></a><span class="lineno">  492</span>  <span class="comment">// OK, timer triggered, and we&#39;re the active wait handler.  Decide what to do.</span></div>
<div class="line"><a id="l00493" name="l00493"></a><span class="lineno">  493</span> </div>
<div class="line"><a id="l00494" name="l00494"></a><span class="lineno">  494</span>  <span class="comment">/* RFC 6298 says that the RTO (DTO in our case) MUST be doubled each time the timeout expires.</span></div>
<div class="line"><a id="l00495" name="l00495"></a><span class="lineno">  495</span><span class="comment">   * We&#39;ll make this a knob for experimentation&#39;s sake.  */</span></div>
<div class="line"><a id="l00496" name="l00496"></a><span class="lineno">  496</span> </div>
<div class="line"><a id="l00497" name="l00497"></a><span class="lineno">  497</span>  <span class="comment">// Change the Peer_socket&#39;s DTO!</span></div>
<div class="line"><a id="l00498" name="l00498"></a><span class="lineno">  498</span> </div>
<div class="line"><a id="l00499" name="l00499"></a><span class="lineno">  499</span>  <span class="comment">// Get the option values.  Lock, obtain, unlock.  (A least overzealous -- but why not?)</span></div>
<div class="line"><a id="l00500" name="l00500"></a><span class="lineno">  500</span>  <span class="comment">// @todo That last comment in parentheses is not grammatical, and I now don&#39;t know what it may have</span></div>
<div class="line"><a id="l00501" name="l00501"></a><span class="lineno">  501</span>  <span class="comment">// meant, when I originally wrote it. Attempt to understand/clarify....</span></div>
<div class="line"><a id="l00502" name="l00502"></a><span class="lineno">  502</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> backoff_factor;</div>
<div class="line"><a id="l00503" name="l00503"></a><span class="lineno">  503</span>  <a class="code hl_typedef" href="namespaceflow.html#a48799f1263cdeedec125be51a3db2b79">Fine_duration</a> ceiling;</div>
<div class="line"><a id="l00504" name="l00504"></a><span class="lineno">  504</span>  {</div>
<div class="line"><a id="l00505" name="l00505"></a><span class="lineno">  505</span>    <a class="code hl_typedef" href="classflow_1_1net__flow_1_1Peer__socket.html#a98c6729b318f28b61e144f8a9b1f4dfc">Peer_socket::Options_lock</a> lock(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a7ab957ddc07d6289d1b42d6686173533">m_sock</a>-&gt;m_opts_mutex);</div>
<div class="line"><a id="l00506" name="l00506"></a><span class="lineno">  506</span>    backoff_factor = <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a7ab957ddc07d6289d1b42d6686173533">m_sock</a>-&gt;m_opts.m_dyn_drop_timeout_backoff_factor;</div>
<div class="line"><a id="l00507" name="l00507"></a><span class="lineno">  507</span>    ceiling = <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a7ab957ddc07d6289d1b42d6686173533">m_sock</a>-&gt;m_opts.m_dyn_drop_timeout_ceiling;</div>
<div class="line"><a id="l00508" name="l00508"></a><span class="lineno">  508</span>  }</div>
<div class="line"><a id="l00509" name="l00509"></a><span class="lineno">  509</span> </div>
<div class="line"><a id="l00510" name="l00510"></a><span class="lineno">  510</span>  <span class="keywordflow">if</span> (backoff_factor != 1)</div>
<div class="line"><a id="l00511" name="l00511"></a><span class="lineno">  511</span>  {</div>
<div class="line"><a id="l00512" name="l00512"></a><span class="lineno">  512</span>    assert(backoff_factor != 0);</div>
<div class="line"><a id="l00513" name="l00513"></a><span class="lineno">  513</span>    <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#ad9db83f50aec60604de55d01e15ea403">m_sock_drop_timeout</a> *= backoff_factor;</div>
<div class="line"><a id="l00514" name="l00514"></a><span class="lineno">  514</span>    <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#ad9db83f50aec60604de55d01e15ea403">m_sock_drop_timeout</a> = min(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#ad9db83f50aec60604de55d01e15ea403">m_sock_drop_timeout</a>, ceiling);</div>
<div class="line"><a id="l00515" name="l00515"></a><span class="lineno">  515</span>    <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Increased DTO by factor [&quot;</span> &lt;&lt; backoff_factor &lt;&lt; <span class="stringliteral">&quot;] with &quot;</span></div>
<div class="line"><a id="l00516" name="l00516"></a><span class="lineno">  516</span>                   <span class="stringliteral">&quot;ceiling [&quot;</span> &lt;&lt; round&lt;milliseconds&gt;(ceiling) &lt;&lt; <span class="stringliteral">&quot;] to &quot;</span></div>
<div class="line"><a id="l00517" name="l00517"></a><span class="lineno">  517</span>                   <span class="stringliteral">&quot;[&quot;</span> &lt;&lt; round&lt;milliseconds&gt;(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#ad9db83f50aec60604de55d01e15ea403">m_sock_drop_timeout</a>) &lt;&lt; <span class="stringliteral">&quot; = &quot;</span> &lt;&lt; <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#ad9db83f50aec60604de55d01e15ea403">m_sock_drop_timeout</a> &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00518" name="l00518"></a><span class="lineno">  518</span>  }</div>
<div class="line"><a id="l00519" name="l00519"></a><span class="lineno">  519</span> </div>
<div class="line"><a id="l00520" name="l00520"></a><span class="lineno">  520</span>  <span class="comment">/* Certainly if the DTO was exceeded, at least the earliest (first) In-flight packet must be</span></div>
<div class="line"><a id="l00521" name="l00521"></a><span class="lineno">  521</span><span class="comment">   * considered Dropped.  (BTW it must exist; if there are no In-flight packets then they had to</span></div>
<div class="line"><a id="l00522" name="l00522"></a><span class="lineno">  522</span><span class="comment">   * have called disable_timer() or never called start_timer(), so we cannot be here.)</span></div>
<div class="line"><a id="l00523" name="l00523"></a><span class="lineno">  523</span><span class="comment">   *</span></div>
<div class="line"><a id="l00524" name="l00524"></a><span class="lineno">  524</span><span class="comment">   * Additionally, we could want to drop ALL In-flight packets.  RFC 6298 does not say to do that,</span></div>
<div class="line"><a id="l00525" name="l00525"></a><span class="lineno">  525</span><span class="comment">   * so doing so would be MORE aggressive than the RFC, which the RFC says MUST not be the done.</span></div>
<div class="line"><a id="l00526" name="l00526"></a><span class="lineno">  526</span><span class="comment">   * However, that&#39;s just more aggressive w/r/t their RECOMMENDED algorithm in section 5.  That&#39;s</span></div>
<div class="line"><a id="l00527" name="l00527"></a><span class="lineno">  527</span><span class="comment">   * not all however: it also explicitly violates the REQUIREMENT that no packet should be Dropped</span></div>
<div class="line"><a id="l00528" name="l00528"></a><span class="lineno">  528</span><span class="comment">   * for DTO reasons unless it was sent at least DTO ago.  E.g., if I sent packet 1 and then in 10</span></div>
<div class="line"><a id="l00529" name="l00529"></a><span class="lineno">  529</span><span class="comment">   * seconds packet 2, then DTO fires in in 1 second, then packet 2 was sent only 1 second ago yet</span></div>
<div class="line"><a id="l00530" name="l00530"></a><span class="lineno">  530</span><span class="comment">   * is Dropped, violating the requirement.</span></div>
<div class="line"><a id="l00531" name="l00531"></a><span class="lineno">  531</span><span class="comment">   *</span></div>
<div class="line"><a id="l00532" name="l00532"></a><span class="lineno">  532</span><span class="comment">   * I&#39;ve seen certain lesser known custom protocols in fact Drop all packets in this case.</span></div>
<div class="line"><a id="l00533" name="l00533"></a><span class="lineno">  533</span><span class="comment">   * I didn&#39;t really know why, but eventually I realized they got that from the DCCP CCID 2</span></div>
<div class="line"><a id="l00534" name="l00534"></a><span class="lineno">  534</span><span class="comment">   * specification (RFC 4341).  DCCP is a UDP-based protocol similar to ours (especially similar</span></div>
<div class="line"><a id="l00535" name="l00535"></a><span class="lineno">  535</span><span class="comment">   * when retransmission is disabled).  That RFC says specifically that a DTO firing should cause</span></div>
<div class="line"><a id="l00536" name="l00536"></a><span class="lineno">  536</span><span class="comment">   * pipe to be set to zero, which means we should drop all packets.  No justification is given, but</span></div>
<div class="line"><a id="l00537" name="l00537"></a><span class="lineno">  537</span><span class="comment">   * this is serious Standards Track RFC, and the first author is Sally Floyd (who wrote the</span></div>
<div class="line"><a id="l00538" name="l00538"></a><span class="lineno">  538</span><span class="comment">   * original SACK RFC among others).  It does make some intuitive sense that whatever led to DTO</span></div>
<div class="line"><a id="l00539" name="l00539"></a><span class="lineno">  539</span><span class="comment">   * means all the data are gone from the pipe.  On the other hand, straight TCP RFCs like 6298</span></div>
<div class="line"><a id="l00540" name="l00540"></a><span class="lineno">  540</span><span class="comment">   * assume retransmission is involved, in which case my brain can&#39;t quite see how the pipe=0 move</span></div>
<div class="line"><a id="l00541" name="l00541"></a><span class="lineno">  541</span><span class="comment">   * is consistent with retransmission and cumulative ACKs, so maybe that&#39;s the source of the</span></div>
<div class="line"><a id="l00542" name="l00542"></a><span class="lineno">  542</span><span class="comment">   * difference between the two.</span></div>
<div class="line"><a id="l00543" name="l00543"></a><span class="lineno">  543</span><span class="comment">   *</span></div>
<div class="line"><a id="l00544" name="l00544"></a><span class="lineno">  544</span><span class="comment">   * Anyway, I make it a knob.  Given the DCCP CCID 2 instruction, I&#39;d probably go with</span></div>
<div class="line"><a id="l00545" name="l00545"></a><span class="lineno">  545</span><span class="comment">   * m_st_drop_all_on_drop_timeout == true. */</span></div>
<div class="line"><a id="l00546" name="l00546"></a><span class="lineno">  546</span> </div>
<div class="line"><a id="l00547" name="l00547"></a><span class="lineno">  547</span>  <span class="comment">// Note: m_timer_running = true.</span></div>
<div class="line"><a id="l00548" name="l00548"></a><span class="lineno">  548</span> </div>
<div class="line"><a id="l00549" name="l00549"></a><span class="lineno">  549</span>  <span class="comment">// Instruct Node what to do with the packet(s) (at least drop one).  This happens SYNCHRONOUSLY (right here).</span></div>
<div class="line"><a id="l00550" name="l00550"></a><span class="lineno">  550</span>  <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a862595a7ec5d4bea05ad0e85c52e88ac">m_timer_fired</a>(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a7ab957ddc07d6289d1b42d6686173533">m_sock</a>-&gt;opt(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a7ab957ddc07d6289d1b42d6686173533">m_sock</a>-&gt;m_opts.m_st_drop_all_on_drop_timeout));</div>
<div class="line"><a id="l00551" name="l00551"></a><span class="lineno">  551</span> </div>
<div class="line"><a id="l00552" name="l00552"></a><span class="lineno">  552</span>  <span class="comment">/* They marked one or all In-flight packets Dropped just now.  It was also their</span></div>
<div class="line"><a id="l00553" name="l00553"></a><span class="lineno">  553</span><span class="comment">   * responsibility to call on_packet_no_longer_in_flight() accordingly. */</span></div>
<div class="line"><a id="l00554" name="l00554"></a><span class="lineno">  554</span>} <span class="comment">// Drop_timer::handle_timer_firing()</span></div>
<div class="line"><a id="l00555" name="l00555"></a><span class="lineno">  555</span> </div>
<div class="line"><a id="l00556" name="l00556"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Drop__timer.html#a40029643f0a6c7a2a6b20499ca4c5a67">  556</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Drop__timer.html#a40029643f0a6c7a2a6b20499ca4c5a67">Drop_timer::timer_failure</a>([[maybe_unused]] Ptr prevent_destruction, <span class="keyword">const</span> <a class="code hl_typedef" href="namespaceflow.html#a29eaaa9d0fac4ce87d8b969222dbed09">Error_code</a>&amp; err_code)</div>
<div class="line"><a id="l00557" name="l00557"></a><span class="lineno">  557</span>{</div>
<div class="line"><a id="l00558" name="l00558"></a><span class="lineno">  558</span>  <span class="keywordflow">if</span> (!<a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a9de653d7372110ffd176ef34e916a7dd">m_done</a>)</div>
<div class="line"><a id="l00559" name="l00559"></a><span class="lineno">  559</span>  {</div>
<div class="line"><a id="l00560" name="l00560"></a><span class="lineno">  560</span>    <a class="code hl_variable" href="classflow_1_1net__flow_1_1Drop__timer.html#a21e78b9da6196043e1c05589c46911fa">m_timer_failure</a>(err_code);</div>
<div class="line"><a id="l00561" name="l00561"></a><span class="lineno">  561</span>  }</div>
<div class="line"><a id="l00562" name="l00562"></a><span class="lineno">  562</span>  <span class="comment">// else they&#39;re not interested in the timer anymore, including any error, so don&#39;t call their failure callback.</span></div>
<div class="line"><a id="l00563" name="l00563"></a><span class="lineno">  563</span>}</div>
<div class="line"><a id="l00564" name="l00564"></a><span class="lineno">  564</span> </div>
<div class="line"><a id="l00565" name="l00565"></a><span class="lineno">  565</span>} <span class="comment">// namespace flow::net_flow</span></div>
<div class="ttc" id="aclassflow_1_1Function_html"><div class="ttname"><a href="classflow_1_1Function.html">flow::Function</a></div><div class="ttdef"><b>Definition:</b> <a href="common_8hpp_source.html#l00512">common.hpp:512</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Log__context_html_a8a5fef42dc2cedf3c0d1a6e83beb2948"><div class="ttname"><a href="classflow_1_1log_1_1Log__context.html#a8a5fef42dc2cedf3c0d1a6e83beb2948">flow::log::Log_context::get_log_component</a></div><div class="ttdeci">const Component &amp; get_log_component() const</div><div class="ttdoc">Returns reference to the stored Component object, particularly as many FLOW_LOG_*() macros expect.</div><div class="ttdef"><b>Definition:</b> <a href="log_8cpp_source.html#l00222">log.cpp:222</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Log__context_html_af4db395042b065b00398cd59845dcb4d"><div class="ttname"><a href="classflow_1_1log_1_1Log__context.html#af4db395042b065b00398cd59845dcb4d">flow::log::Log_context::get_logger</a></div><div class="ttdeci">Logger * get_logger() const</div><div class="ttdoc">Returns the stored Logger pointer, particularly as many FLOW_LOG_*() macros expect.</div><div class="ttdef"><b>Definition:</b> <a href="log_8cpp_source.html#l00217">log.cpp:217</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Logger_html"><div class="ttname"><a href="classflow_1_1log_1_1Logger.html">flow::log::Logger</a></div><div class="ttdoc">Interface that the user should implement, passing the implementing Logger into logging classes (Flow'...</div><div class="ttdef"><b>Definition:</b> <a href="log_8hpp_source.html#l01280">log.hpp:1284</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Logger_html_ac8a2e7a33fe3fbc0c29ead62ed98c022"><div class="ttname"><a href="classflow_1_1log_1_1Logger.html#ac8a2e7a33fe3fbc0c29ead62ed98c022">flow::log::Logger::should_log</a></div><div class="ttdeci">virtual bool should_log(Sev sev, const Component &amp;component) const =0</div><div class="ttdoc">Given attributes of a hypothetical message that would be logged, return true if that message should b...</div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Drop__timer_html_a0930c4da4484ffc1f8bcfbc496e5ecd0"><div class="ttname"><a href="classflow_1_1net__flow_1_1Drop__timer.html#a0930c4da4484ffc1f8bcfbc496e5ecd0">flow::net_flow::Drop_timer::packet_id_t</a></div><div class="ttdeci">Sequence_number::seq_num_t packet_id_t</div><div class="ttdoc">Type to uniquely identify a packet sent over the wire in the socket to which this Drop_timer applies.</div><div class="ttdef"><b>Definition:</b> <a href="drop__timer_8hpp_source.html#l00162">drop_timer.hpp:162</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Drop__timer_html_a0d90b548d2c7062e1ac88b998a2fc1d5"><div class="ttname"><a href="classflow_1_1net__flow_1_1Drop__timer.html#a0d90b548d2c7062e1ac88b998a2fc1d5">flow::net_flow::Drop_timer::m_during_events_newest_acked_packet</a></div><div class="ttdeci">packet_id_t m_during_events_newest_acked_packet</div><div class="ttdoc">During the time period starting with the last start_contemporaneous_events() call and ending with the...</div><div class="ttdef"><b>Definition:</b> <a href="drop__timer_8hpp_source.html#l00467">drop_timer.hpp:467</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Drop__timer_html_a21e78b9da6196043e1c05589c46911fa"><div class="ttname"><a href="classflow_1_1net__flow_1_1Drop__timer.html#a21e78b9da6196043e1c05589c46911fa">flow::net_flow::Drop_timer::m_timer_failure</a></div><div class="ttdeci">Function&lt; void(const Error_code &amp;err_code)&gt; m_timer_failure</div><div class="ttdoc">Called on error. See Drop_timer constructor.</div><div class="ttdef"><b>Definition:</b> <a href="drop__timer_8hpp_source.html#l00436">drop_timer.hpp:436</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Drop__timer_html_a2ae6617225acb8c4b0798f113c1827d0"><div class="ttname"><a href="classflow_1_1net__flow_1_1Drop__timer.html#a2ae6617225acb8c4b0798f113c1827d0">flow::net_flow::Drop_timer::m_at_events_start_oldest_flying_packet</a></div><div class="ttdeci">packet_id_t m_at_events_start_oldest_flying_packet</div><div class="ttdoc">The packet ID of the least recently sent In-flight packet at last start_contemporaneous_events() call...</div><div class="ttdef"><b>Definition:</b> <a href="drop__timer_8hpp_source.html#l00459">drop_timer.hpp:459</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Drop__timer_html_a40029643f0a6c7a2a6b20499ca4c5a67"><div class="ttname"><a href="classflow_1_1net__flow_1_1Drop__timer.html#a40029643f0a6c7a2a6b20499ca4c5a67">flow::net_flow::Drop_timer::timer_failure</a></div><div class="ttdeci">void timer_failure(Ptr prevent_destruction, const Error_code &amp;err_code)</div><div class="ttdoc">Called by boost.asio after we post it, in the event of some timer error.</div><div class="ttdef"><b>Definition:</b> <a href="drop__timer_8cpp_source.html#l00556">drop_timer.cpp:556</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Drop__timer_html_a45d4cf2dfecc2cd5c35f452cd7c8d05d"><div class="ttname"><a href="classflow_1_1net__flow_1_1Drop__timer.html#a45d4cf2dfecc2cd5c35f452cd7c8d05d">flow::net_flow::Drop_timer::end_contemporaneous_events</a></div><div class="ttdeci">void end_contemporaneous_events()</div><div class="ttdoc">Finishes the group started by start start_contemporaneous_events().</div><div class="ttdef"><b>Definition:</b> <a href="drop__timer_8cpp_source.html#l00118">drop_timer.cpp:118</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Drop__timer_html_a477fd69a6978cc228b8e80611aa234ba"><div class="ttname"><a href="classflow_1_1net__flow_1_1Drop__timer.html#a477fd69a6978cc228b8e80611aa234ba">flow::net_flow::Drop_timer::on_ack</a></div><div class="ttdeci">void on_ack(packet_id_t packet_id)</div><div class="ttdoc">Indicates that a packet for which on_packet_in_flight() was called has just been validly acked.</div><div class="ttdef"><b>Definition:</b> <a href="drop__timer_8cpp_source.html#l00072">drop_timer.cpp:72</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Drop__timer_html_a4a5f0bbb91232e17e258722e4dfa237b"><div class="ttname"><a href="classflow_1_1net__flow_1_1Drop__timer.html#a4a5f0bbb91232e17e258722e4dfa237b">flow::net_flow::Drop_timer::start_timer</a></div><div class="ttdeci">void start_timer()</div><div class="ttdoc">Starts a new wait on the timer, so that is it asynchronously triggered according to the current DTO v...</div><div class="ttdef"><b>Definition:</b> <a href="drop__timer_8cpp_source.html#l00347">drop_timer.cpp:347</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Drop__timer_html_a5d1fff72b5c044cba0651de0508553e0"><div class="ttname"><a href="classflow_1_1net__flow_1_1Drop__timer.html#a5d1fff72b5c044cba0651de0508553e0">flow::net_flow::Drop_timer::on_packet_no_longer_in_flight</a></div><div class="ttdeci">void on_packet_no_longer_in_flight(packet_id_t packet_id)</div><div class="ttdoc">Indicates that a packet for which on_packet_in_flight() was called is now no longer considered In-fli...</div><div class="ttdef"><b>Definition:</b> <a href="drop__timer_8cpp_source.html#l00092">drop_timer.cpp:92</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Drop__timer_html_a60e386c24490bd5880e9e8700e59ca6d"><div class="ttname"><a href="classflow_1_1net__flow_1_1Drop__timer.html#a60e386c24490bd5880e9e8700e59ca6d">flow::net_flow::Drop_timer::~Drop_timer</a></div><div class="ttdeci">~Drop_timer()</div><div class="ttdoc">Destructor.</div><div class="ttdef"><b>Definition:</b> <a href="drop__timer_8cpp_source.html#l00316">drop_timer.cpp:316</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Drop__timer_html_a64def367e38954d8a392cdf92fcc8f24"><div class="ttname"><a href="classflow_1_1net__flow_1_1Drop__timer.html#a64def367e38954d8a392cdf92fcc8f24">flow::net_flow::Drop_timer::create_drop_timer</a></div><div class="ttdeci">static Ptr create_drop_timer(log::Logger *logger_ptr, util::Task_engine *node_task_engine, Fine_duration *sock_drop_timeout, Peer_socket::Const_ptr &amp;&amp;sock, const Function&lt; void(const Error_code &amp;err_code)&gt; &amp;timer_failure, const Function&lt; void(bool drop_all_packets)&gt; &amp;timer_fired)</div><div class="ttdoc">Constructs Drop_timer and returns a ref-counted pointer wrapping it.</div><div class="ttdef"><b>Definition:</b> <a href="drop__timer_8cpp_source.html#l00027">drop_timer.cpp:28</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Drop__timer_html_a7ab957ddc07d6289d1b42d6686173533"><div class="ttname"><a href="classflow_1_1net__flow_1_1Drop__timer.html#a7ab957ddc07d6289d1b42d6686173533">flow::net_flow::Drop_timer::m_sock</a></div><div class="ttdeci">const Peer_socket::Const_ptr m_sock</div><div class="ttdoc">The containing Peer_socket (note that this is read-only access).</div><div class="ttdef"><b>Definition:</b> <a href="drop__timer_8hpp_source.html#l00392">drop_timer.hpp:392</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Drop__timer_html_a83bacd0cfe7c6fb6349688012d472f1f"><div class="ttname"><a href="classflow_1_1net__flow_1_1Drop__timer.html#a83bacd0cfe7c6fb6349688012d472f1f">flow::net_flow::Drop_timer::m_flying_packets</a></div><div class="ttdeci">std::set&lt; packet_id_t &gt; m_flying_packets</div><div class="ttdoc">Packet IDs of packets to have been sent over wire and still considered In-flight, ordered from earlie...</div><div class="ttdef"><b>Definition:</b> <a href="drop__timer_8hpp_source.html#l00453">drop_timer.hpp:453</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Drop__timer_html_a862595a7ec5d4bea05ad0e85c52e88ac"><div class="ttname"><a href="classflow_1_1net__flow_1_1Drop__timer.html#a862595a7ec5d4bea05ad0e85c52e88ac">flow::net_flow::Drop_timer::m_timer_fired</a></div><div class="ttdeci">Function&lt; void(bool drop_all_packets)&gt; m_timer_fired</div><div class="ttdoc">Called on Drop Timeout. See Drop_timer constructor.</div><div class="ttdef"><b>Definition:</b> <a href="drop__timer_8hpp_source.html#l00439">drop_timer.hpp:439</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Drop__timer_html_a9528326a35b021bb859bed948ae3d7a4"><div class="ttname"><a href="classflow_1_1net__flow_1_1Drop__timer.html#a9528326a35b021bb859bed948ae3d7a4">flow::net_flow::Drop_timer::m_timer_running</a></div><div class="ttdeci">bool m_timer_running</div><div class="ttdoc">Is there an active (non-obsolete, not-canceled) asynchronous wait in progress on m_timer?...</div><div class="ttdef"><b>Definition:</b> <a href="drop__timer_8hpp_source.html#l00408">drop_timer.hpp:408</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Drop__timer_html_a9c94b0191a80afb98b6da4a2d0b47a46"><div class="ttname"><a href="classflow_1_1net__flow_1_1Drop__timer.html#a9c94b0191a80afb98b6da4a2d0b47a46">flow::net_flow::Drop_timer::Drop_timer</a></div><div class="ttdeci">Drop_timer(log::Logger *logger, util::Task_engine *node_task_engine, Fine_duration *sock_drop_timeout, Peer_socket::Const_ptr &amp;&amp;sock, const Function&lt; void(const Error_code &amp;err_code)&gt; &amp;timer_failure, const Function&lt; void(bool drop_all_packets)&gt; &amp;timer_fired)</div><div class="ttdoc">Constructs Drop_timer as described in the factory constructor create_drop_timer().</div><div class="ttdef"><b>Definition:</b> <a href="drop__timer_8cpp_source.html#l00293">drop_timer.cpp:293</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Drop__timer_html_a9de653d7372110ffd176ef34e916a7dd"><div class="ttname"><a href="classflow_1_1net__flow_1_1Drop__timer.html#a9de653d7372110ffd176ef34e916a7dd">flow::net_flow::Drop_timer::m_done</a></div><div class="ttdeci">bool m_done</div><div class="ttdoc">true if and only if done() has been called. Starts at false, can only change to true.</div><div class="ttdef"><b>Definition:</b> <a href="drop__timer_8hpp_source.html#l00433">drop_timer.hpp:433</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Drop__timer_html_aa9af1ac250a1a40f3c8df5878e55b98c"><div class="ttname"><a href="classflow_1_1net__flow_1_1Drop__timer.html#aa9af1ac250a1a40f3c8df5878e55b98c">flow::net_flow::Drop_timer::m_current_wait_id</a></div><div class="ttdeci">timer_wait_id_t m_current_wait_id</div><div class="ttdoc">Unique (within this object) identifier of the last start_timer() call.</div><div class="ttdef"><b>Definition:</b> <a href="drop__timer_8hpp_source.html#l00430">drop_timer.hpp:430</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Drop__timer_html_aaf4f0fce1d41e16309beca40a126e2f0"><div class="ttname"><a href="classflow_1_1net__flow_1_1Drop__timer.html#aaf4f0fce1d41e16309beca40a126e2f0">flow::net_flow::Drop_timer::handle_timer_firing</a></div><div class="ttdeci">void handle_timer_firing(Ptr prevent_destruction, timer_wait_id_t wait_id, const Error_code &amp;sys_err_code)</div><div class="ttdoc">Called by boost.asio when the Drop Timer fires; disables timer and calls an outside action callback (...</div><div class="ttdef"><b>Definition:</b> <a href="drop__timer_8cpp_source.html#l00462">drop_timer.cpp:462</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Drop__timer_html_ab6b96e0200579afdee1bf1ce58ab5ad2"><div class="ttname"><a href="classflow_1_1net__flow_1_1Drop__timer.html#ab6b96e0200579afdee1bf1ce58ab5ad2">flow::net_flow::Drop_timer::done</a></div><div class="ttdeci">void done()</div><div class="ttdoc">Causes the Drop_timer to guarantee none of the action callbacks provided at construction will be call...</div><div class="ttdef"><b>Definition:</b> <a href="drop__timer_8cpp_source.html#l00321">drop_timer.cpp:321</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Drop__timer_html_abf88c319884e5c5eb1b8f63c646e90ad"><div class="ttname"><a href="classflow_1_1net__flow_1_1Drop__timer.html#abf88c319884e5c5eb1b8f63c646e90ad">flow::net_flow::Drop_timer::start_contemporaneous_events</a></div><div class="ttdeci">void start_contemporaneous_events()</div><div class="ttdoc">Indicates the start of a series of zero or more contemporary on_*() event calls, to be marked as fini...</div><div class="ttdef"><b>Definition:</b> <a href="drop__timer_8cpp_source.html#l00041">drop_timer.cpp:41</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Drop__timer_html_ac5a7ab3108a915999e95ccf705006ccd"><div class="ttname"><a href="classflow_1_1net__flow_1_1Drop__timer.html#ac5a7ab3108a915999e95ccf705006ccd">flow::net_flow::Drop_timer::on_no_packets_in_flight_any_longer</a></div><div class="ttdeci">void on_no_packets_in_flight_any_longer()</div><div class="ttdoc">Equivalent to on_packet_no_longer_in_flight(P), for all P currently In-flight as registered by on_pac...</div><div class="ttdef"><b>Definition:</b> <a href="drop__timer_8cpp_source.html#l00105">drop_timer.cpp:105</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Drop__timer_html_ad5dfc3cd2f8e5e4d28c49e28ee5c221f"><div class="ttname"><a href="classflow_1_1net__flow_1_1Drop__timer.html#ad5dfc3cd2f8e5e4d28c49e28ee5c221f">flow::net_flow::Drop_timer::m_timer</a></div><div class="ttdeci">util::Timer m_timer</div><div class="ttdoc">The Drop Timer itself.</div><div class="ttdef"><b>Definition:</b> <a href="drop__timer_8hpp_source.html#l00398">drop_timer.hpp:398</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Drop__timer_html_ad655d5461aa5a6bf9a80d28e4a4fdd77"><div class="ttname"><a href="classflow_1_1net__flow_1_1Drop__timer.html#ad655d5461aa5a6bf9a80d28e4a4fdd77">flow::net_flow::Drop_timer::disable_timer</a></div><div class="ttdeci">void disable_timer()</div><div class="ttdoc">Invalidates the running asynchronous wait on m_timer. Pre-condition: m_timer_running.</div><div class="ttdef"><b>Definition:</b> <a href="drop__timer_8cpp_source.html#l00437">drop_timer.cpp:437</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Drop__timer_html_ad9db6f435dfc65b7bd4b539467f1c3ec"><div class="ttname"><a href="classflow_1_1net__flow_1_1Drop__timer.html#ad9db6f435dfc65b7bd4b539467f1c3ec">flow::net_flow::Drop_timer::timer_wait_id_t</a></div><div class="ttdeci">uint64_t timer_wait_id_t</div><div class="ttdoc">The counter type used to distinguish a given start_timer() call from any other such call (for this ob...</div><div class="ttdef"><b>Definition:</b> <a href="drop__timer_8hpp_source.html#l00297">drop_timer.hpp:297</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Drop__timer_html_ad9db83f50aec60604de55d01e15ea403"><div class="ttname"><a href="classflow_1_1net__flow_1_1Drop__timer.html#ad9db83f50aec60604de55d01e15ea403">flow::net_flow::Drop_timer::m_sock_drop_timeout</a></div><div class="ttdeci">Fine_duration &amp; m_sock_drop_timeout</div><div class="ttdoc">Reference to the containing Peer_socket's Peer_socket::m_snd_drop_timeout data member (= DTO,...</div><div class="ttdef"><b>Definition:</b> <a href="drop__timer_8hpp_source.html#l00385">drop_timer.hpp:385</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Drop__timer_html_addd06c5f17e59cbfd70677831a66bc57"><div class="ttname"><a href="classflow_1_1net__flow_1_1Drop__timer.html#addd06c5f17e59cbfd70677831a66bc57">flow::net_flow::Drop_timer::m_in_events_group</a></div><div class="ttdeci">bool m_in_events_group</div><div class="ttdoc">true if and only if the last start_contemporaneous_events() call exists, and either end_contemporaneo...</div><div class="ttdef"><b>Definition:</b> <a href="drop__timer_8hpp_source.html#l00473">drop_timer.hpp:473</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Drop__timer_html_afc1bf0978b04d454f5aa228a44550565"><div class="ttname"><a href="classflow_1_1net__flow_1_1Drop__timer.html#afc1bf0978b04d454f5aa228a44550565">flow::net_flow::Drop_timer::on_packet_in_flight</a></div><div class="ttdeci">void on_packet_in_flight(packet_id_t packet_id)</div><div class="ttdoc">Indicates that a packet identified by the given unique ID has just been sent over the wire (the low-l...</div><div class="ttdef"><b>Definition:</b> <a href="drop__timer_8cpp_source.html#l00052">drop_timer.cpp:52</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Peer__socket_html_a98c6729b318f28b61e144f8a9b1f4dfc"><div class="ttname"><a href="classflow_1_1net__flow_1_1Peer__socket.html#a98c6729b318f28b61e144f8a9b1f4dfc">flow::net_flow::Peer_socket::Options_lock</a></div><div class="ttdeci">util::Lock_guard&lt; Options_mutex &gt; Options_lock</div><div class="ttdoc">Short-hand for lock that acquires exclusive access to an Options_mutex.</div><div class="ttdef"><b>Definition:</b> <a href="peer__socket_8hpp_source.html#l00885">peer_socket.hpp:885</a></div></div>
<div class="ttc" id="aclassflow_1_1util_1_1Shared__ptr__alias__holder_html_aa4f1af88393042e60159a3a67f0accbc"><div class="ttname"><a href="classflow_1_1util_1_1Shared__ptr__alias__holder.html#aa4f1af88393042e60159a3a67f0accbc">flow::util::Shared_ptr_alias_holder&lt; boost::shared_ptr&lt; Drop_timer &gt; &gt;::Ptr</a></div><div class="ttdeci">boost::shared_ptr&lt; Drop_timer &gt; Ptr</div><div class="ttdoc">Short-hand for ref-counted pointer to mutable values of type Target_type::element_type (a-la T*).</div><div class="ttdef"><b>Definition:</b> <a href="shared__ptr__alias__holder_8hpp_source.html#l00125">shared_ptr_alias_holder.hpp:125</a></div></div>
<div class="ttc" id="aclassflow_1_1util_1_1Shared__ptr__alias__holder_html_aef7998db71c60eeb5d1e3d1a97c14886"><div class="ttname"><a href="classflow_1_1util_1_1Shared__ptr__alias__holder.html#aef7998db71c60eeb5d1e3d1a97c14886">flow::util::Shared_ptr_alias_holder&lt; boost::shared_ptr&lt; Peer_socket &gt; &gt;::Const_ptr</a></div><div class="ttdeci">Const_target_ptr Const_ptr</div><div class="ttdoc">Short-hand for ref-counted pointer to immutable values of type Target_type::element_type (a-la T cons...</div><div class="ttdef"><b>Definition:</b> <a href="shared__ptr__alias__holder_8hpp_source.html#l00127">shared_ptr_alias_holder.hpp:127</a></div></div>
<div class="ttc" id="adrop__timer_8hpp_html"><div class="ttname"><a href="drop__timer_8hpp.html">drop_timer.hpp</a></div></div>
<div class="ttc" id="aerror_2error_8hpp_html_a019ee6e90802e444572dd78d312d6e23"><div class="ttname"><a href="error_2error_8hpp.html#a019ee6e90802e444572dd78d312d6e23">FLOW_ERROR_SYS_ERROR_LOG_WARNING</a></div><div class="ttdeci">#define FLOW_ERROR_SYS_ERROR_LOG_WARNING()</div><div class="ttdoc">Logs a warning about the (often errno-based or from a library) error code in sys_err_code.</div><div class="ttdef"><b>Definition:</b> <a href="error_2error_8hpp_source.html#l00269">error.hpp:269</a></div></div>
<div class="ttc" id="alog_8hpp_html_affcf2e4c496ce3f42adf981669c623b8"><div class="ttname"><a href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a></div><div class="ttdeci">#define FLOW_LOG_TRACE(ARG_stream_fragment)</div><div class="ttdoc">Logs a TRACE message into flow::log::Logger *get_logger() with flow::log::Component get_log_component...</div><div class="ttdef"><b>Definition:</b> <a href="log_8hpp_source.html#l00227">log.hpp:227</a></div></div>
<div class="ttc" id="anamespaceflow_1_1log_html_a5c602384e6fe9d7642740ac2fae4ad04"><div class="ttname"><a href="namespaceflow_1_1log.html#a5c602384e6fe9d7642740ac2fae4ad04">flow::log::Sev</a></div><div class="ttdeci">Sev</div><div class="ttdoc">Enumeration containing one of several message severity levels, ordered from highest to lowest.</div><div class="ttdef"><b>Definition:</b> <a href="log__fwd_8hpp_source.html#l00223">log_fwd.hpp:224</a></div></div>
<div class="ttc" id="anamespaceflow_1_1net__flow_html"><div class="ttname"><a href="namespaceflow_1_1net__flow.html">flow::net_flow</a></div><div class="ttdoc">Flow module containing the API and implementation of the Flow network protocol, a TCP-inspired stream...</div><div class="ttdef"><b>Definition:</b> <a href="asio_2node_8cpp_source.html#l00024">node.cpp:25</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_a03984e29450abf9cf287c501d6c8f866"><div class="ttname"><a href="namespaceflow_1_1util.html#a03984e29450abf9cf287c501d6c8f866">flow::util::key_exists</a></div><div class="ttdeci">bool key_exists(const Container &amp;container, const typename Container::key_type &amp;key)</div><div class="ttdoc">Returns true if and only if the given key is present at least once in the given associative container...</div><div class="ttdef"><b>Definition:</b> <a href="util_2util_8hpp_source.html#l00301">util.hpp:301</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_ac3e89a8a271b0ddc76ac2a0ce488dea4"><div class="ttname"><a href="namespaceflow_1_1util.html#ac3e89a8a271b0ddc76ac2a0ce488dea4">flow::util::Task_engine</a></div><div class="ttdeci">boost::asio::io_context Task_engine</div><div class="ttdoc">Short-hand for boost.asio event service, the central class of boost.asio.</div><div class="ttdef"><b>Definition:</b> <a href="util__fwd_8hpp_source.html#l00135">util_fwd.hpp:135</a></div></div>
<div class="ttc" id="anamespaceflow_html_a29eaaa9d0fac4ce87d8b969222dbed09"><div class="ttname"><a href="namespaceflow.html#a29eaaa9d0fac4ce87d8b969222dbed09">flow::Error_code</a></div><div class="ttdeci">boost::system::error_code Error_code</div><div class="ttdoc">Short-hand for a boost.system error code (which basically encapsulates an integer/enum error code and...</div><div class="ttdef"><b>Definition:</b> <a href="common_8hpp_source.html#l00508">common.hpp:508</a></div></div>
<div class="ttc" id="anamespaceflow_html_a3938730ab4b89daf13d027a5f620e7ce"><div class="ttname"><a href="namespaceflow.html#a3938730ab4b89daf13d027a5f620e7ce">flow::Flow_log_component</a></div><div class="ttdeci">Flow_log_component</div><div class="ttdoc">The flow::log::Component payload enumeration comprising various log components used by Flow's own int...</div><div class="ttdef"><b>Definition:</b> <a href="common_8hpp_source.html#l00637">common.hpp:638</a></div></div>
<div class="ttc" id="anamespaceflow_html_a48799f1263cdeedec125be51a3db2b79"><div class="ttname"><a href="namespaceflow.html#a48799f1263cdeedec125be51a3db2b79">flow::Fine_duration</a></div><div class="ttdeci">Fine_clock::duration Fine_duration</div><div class="ttdoc">A high-res time duration as computed from two Fine_time_pts.</div><div class="ttdef"><b>Definition:</b> <a href="common_8hpp_source.html#l00416">common.hpp:416</a></div></div>
<div class="ttc" id="anamespaceflow_html_a9d9cc2eeb10d398cff5591d446b763b8"><div class="ttname"><a href="namespaceflow.html#a9d9cc2eeb10d398cff5591d446b763b8">flow::Fine_time_pt</a></div><div class="ttdeci">Fine_clock::time_point Fine_time_pt</div><div class="ttdoc">A high-res time point as returned by Fine_clock::now() and suitable for precise time math in general.</div><div class="ttdef"><b>Definition:</b> <a href="common_8hpp_source.html#l00413">common.hpp:413</a></div></div>
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